Episode Guide

Buried Lies: Part 1

 * Suspecting that a drowned child had been a victim of physical abuse, Dr Ryan reopens another case involving a child's death. The common factor: Gary Philips, who was the mother's partner at the time of the death three years earlier.

Buried Lies: Part 2

 * Suspecting that a drowned child had been a victim of physical abuse, Dr Ryan reopens another case involving a child's death. The common factor, Gary Philips, was the mother's partner at the time of the death three years earlier.

Long Days, Short Nights: Part 2

 * Dr Sam Ryan becomes entangled with the occult when carrying out a post-mortem of a student.

Darkness Visible: Part 1

 * A man is found dead in his cell and it is clear to Sam that he was murdered.

Darkness Visible: Part 2

 * Sam investigates the murder of a man found in his cell and a police officer.

Sins of the Fathers: Part 1

 * Tran seeks Sam's advice.

Blood, Sweat and Tears: Part 1

 * A boxing trainer's methods are questioned.

Only the Lonely: Part 1

 * Evidence points to the husband when a young wife and her lover are brutally murdered.

Only the Lonely: Part 2

 * Bruises on one of the bodies suggest the killer had six fingers.

Friends Like These: Part 1

 * Sam is enjoying her relationship with Peter Ross, when a savage and apparently random murder demands their attention. She sees two boys re-enacting a killing and becomes certain that the police are pursuing the wrong suspect.

Friends Like These: Part 2

 * When an old woman's body is found, Chris Palmer becomes the first suspect, but Sam sets out to find who the real killer is.

Fallen Idol: Part 1

 * Sam Ryan probes a teen's death and uncovers scandalous family secrets.

Fallen Idol: Part 2

 * Sam probes the murder of a young woman found dead in an empty house.

Divided Loyalties: Part 1

 * Police dismiss the case of the deaths of a local drug user and her child, but a third death convinces Sam that a serial killer is responsible.

Divided Loyalties: Part 2

 * Sam remains convinced that a personal tragedy is at the root of the crimes, which appear to be either vigilante or drug-war related.

Brothers in Arms: Part 1

 * Sam Ryan decides the death of a local farmer is accidental, but a murder case in Northern Ireland leads her to question that judgment.

Brothers in Arms: Part 2

 * Sam (Amanda Burton) overlooks evidence on a mutilated corpse. With William Armstrong, Nick Reding and Mark Letheren.

Gone Tomorrow: Part 1

 * Sam Ryan discovers that the pilot of a crashed helicopter had a heart attack.

Gone Tomorrow: Part 2

 * While blood tests indicate the helicopter pilot was drinking, a rotor bolt may have played a role in the crash.

A Kind of Justice: Part 1

 * A murder suspect is, in turn, found dead.

A Kind of Justice: Part 2

 * Sam's post-mortem reveals Brian may have been murdered.

A Good Body: Part 1

 * A man thought dead resurfaces as a victim in a devastating fire.

A Good Body: Part 2

 * The man convicted of killing Terry Fulton is released from prison to become a murder target.

The World Cruise: Part 1

 * Conflicting ideas muddle an investigation into the suspicious deaths of two brothers.

The World Cruise: Part 2

 * Ranjeet finally catches a break when he links the two brothers' deaths to the murder of an elderly Belgian man, but he begins to discover more than he bargained for.

Two Below Zero: Part 1

 * Sam jets off to Norway to identify a frozen body discovered by terrified skiers at a summer ski resort.

Two Below Zero: Part 2

 * A third frozen body turns up and Sam decides that the police should be on the lookout for a serial killer.

Faith: Part 1

 * Sam takes on the case of a long-dead nun with saintly credentials.

Faith: Part 2

 * Sam and DI Toner manage to uncover fresh evidence in the Dupen murder case.

Fall Out: Part 1

 * Sam Ryan and her team are called out to a major pile-up on a busy road which has left 11 people dead and many more injured. Among the wreckage and bodies, they discover a severed arm which doesn't belong to any of the victims, and Sam's suspicions are aroused when DCI Deacon appears to be overtly interested in one of the corpses.

Fall Out: Part 2

 * A young Albanian girl identifies a mutilated body pulled from the Thames as her sister, who was forced into prostitution by her uncle. Meanwhile, evidence links DCI Deacon to one of the police officers involved in the road crash, and Sam attempts to make the connection between the two cases.

Kilth and Kill: Part 1

 * Sam and Leo are called to the scene of a multiple murder, with three members of the same family lying dead in a suburban home and two more badly injured. Sam allows herself to be romanced when an old flame appears on the scene. And Harry takes on a seemingly routine case when an old lady is found dead at the foot of her stairs.

Kilth and Kill: Part 2

 * Sam and Leo are called to a multiple murder scene. Behind the walls of a suburban home, three family members lie dead and two more are injured.

Tell No Tales: Part 1

 * The team identify a man with a criminal past when a partially mummified corpse is found amidst the rubble of an old factory building. Meanwhile, back at the university, Leo and Harry are asked by the Dean to give the students a pep talk when drugs go missing from the toxicology lab.

Tell No Tales: Part 2

 * Selina is attacked by Ridley's associates as Sam gets closer to the truth behind Marcus Saul's death. Meanwhile, Leo finds himself in hot water over his controversial post-mortem report on Natalie.

Closed Ranks: Part 1

 * Sam and Leo investigate serial killings; Harry conducts a postmortem exam on an old friend.

Closed Ranks: Part 2

 * Sam discovers Gabby Langton's body, fixing greater attention on the police college.

Answering Fire: Part 1

 * A suspected terrorist attack causes an explosion in a hotel where a government minister is staying, and an old friend of Sam's is at the scene. As Sam and her team delve deeper into the case, Sam also has to deal with her attempted rape.

Answering Fire: Part 2

 * An independent pathologist is brought in to conduct a second autopsy on Ayesha Khan, undermining Sam's initial findings.

Fatal Error: Part 1

 * Sam and Leo are on opposing sides of a high-profile court case.

Fatal Error: Part 2

 * Sam uncovers a crippling truth about her involvement in a case 13 years ago.

Running on Empty: Part 1

 * Alice Delaney, a top sports agent, is found dead in the grounds of her office building. Sam is sure that her death is linked to the death of a prominent athlete.

Running on Empty: Part 2

 * Sam's investigations reveal that Alice was pregnant and that Charlton was involved in a struggle before he died.

Beyond Guilt: Part 1

 * A vehicle with a dead body in the passenger seat turns up in a car park.

Beyond Guilt: Part 2

 * Sam and her team begin to suspect they are being used by the Home Office, while Leo and Harry follow up their own leads to discover an alarming truth about Sachs.

A Time To Heal: Part 1

 * Sam Ryan embarks on a journey home to Northern Ireland when the team is called out to investigate the discovery of the bodies of two men killed by paramilitaries twenty years ago - and finds that their secrets live on in the new corridors of Belfast power.

A Time To Heal: Part 2

 * As Sam struggles to find reconciliation with her estranged son, the investigation takes a darker turn as she has to face up to the possibility that her father may have been involved in police corruption and even murder.

Death By Water: Part 1

 * Now that Sam has left, Leo is faced with the decision of whether to take over her job. Meanwhile Leo and Harry clash over an investigation into an outbreak of disease among school children on the South Coast.

Nowhere Fast: Part 1

 * When members of a syndicate owning a prize racehorse are killed in a helicopter crash, Leo and Harry investigate a complex betting scam. Meanwhile the mortuary finds itself with an unconventional new member of staff.

Nowhere Fast: Part 2

 * New girl Nikki joins the team as Harry finds himself implicated in a corrupt officer's enthusiasm to get a conviction. Leo investigates a cash-for-transplants ring.

Body 21: Part 1

 * The team is approached by a support group of survivors from a recent train crash. What caused the tragedy, and what is the identity of the unidentified Body 21?

Body 21: Part 2

 * As the identity of the mysterious Body 21 is revealed, Harry, Nikki and Leo are getting closer to finding out what caused the train crash - with tragic consequences for one of the heroes of the disaster.

Ghosts: Part 1

 * When his wife and teenage daughter are involved in a hit-and-run car crash, Leo begins a painful journey back to his native Sheffield. Leo struggles to accept the facts and soon finds himself at odds with the Sheffield team investigating the incident. In London, Nikki investigates the murders of two unidentified women and she too finds the police uncooperative.

Ghosts: Part 2

 * Increasingly isolated from the authorities, Leo continues his quest to find the man responsible for the deaths of his wife and daughter.

Choices: Part 1

 * A submachine gun attack on a group of teenagers outside a London nightclub brings the team into the unfamiliar urban world of street gangs. Harry helps the forensic investigation and it becomes clear that a turf war between rival gangs is brewing on the estate. Meanwhile, Nikki uncovers the decomposed body of a drug addict and finds herself in conflict with a detective.

Choices: Part 2

 * As the authorities strive to prevent an escalation in the gang war, Harry is drawn into an unlikely friendship with Wayne, a boy from the estate. As it emerges that both gangs are buying guns from the same illegal armourer, Harry realises that Wayne is the key to solving the case, but he must betray the boy's trust to do so. Nikki's detective partner's heart isn't as hard as she'd thought.

The Meaning of Death: Part 1

 * When her grandmother passes away, Nikki begins to have doubts about her profession. As she experiences a crisis of faith, the team is drawn into the investigation of a series of brutal, apparently motiveless murders. The trail leads into the unfamiliar and rarefied world of obscure academic philosophy. Meanwhile, Harry investigates the death of a woman who appears to have drowned in three inches of water.

The Meaning of Death: Part 2

 * Nikki and Leo follow the trail of the philosophical serial killer, and Nikki's beliefs are put to the test as she realises they are facing the type of murder that's committed for sheer pleasure. Faith wins through as, unexpectedly, it is her grandmother's picture of Christ on the cross that provides her with the final clue. Elsewhere, Harry uncovers the truth about the drowning victim.

Mind and Body: Part 1

 * A paranoid schizophrenic goes on a frenzy in a busy high street and two people are left dead. However when a young man suffering from depression commits suicide and it turns out that he is a resident at the same mental health care home as the schizophrenic, Nikki becomes convinced that there is a connection.

Mind and Body: Part 2

 * Nikki and Harry realise that the source of the faked medication is in fact a clever and callous wholesaler who is watering down the drugs he sells in order to increase his profit. There is one last psychotic patient out on the streets who is taking the wrong medication - can Nikki find him before he kills someone else?

Cargo: Part 1

 * When a boat carrying illegal passengers is found crashed in the Thames, the team investigate.

Cargo: Part 2

 * A boat carrying illegal immigrants has been wrecked on the Thames and the team must now find any remaining survivors before a highly contagious disease breaks out into the community.

Terminus: Part 1

 * The team investigate a hit-and-run accident, an arson and a woman who collapsed on her hen night.

Terminus: Part 2

 * The team investigate a man who died on a night bus, an office prank gone tragically wrong, and the suicide of a professional footballer.

A Body of Work: Part 1

 * Harry and Nikki's friendship is rocked by the discovery of the body of Harry's ex-lover. Will they survive the pressures the case puts them under?

Supernova: Part 1

 * Memories of his own daughter's death are stirred up when Leo is called in to investigate the apparent suicide of a fourteen-year-old girl.

Supernova: Part 2

 * When a third killing takes place on school grounds, Leo races against time to find some connection between the apparently motiveless murders.

Schism: Part 1

 * Harry and Nikki are drawn into a war between a medical research establishment and a group determined to take direct action - a war that will place Nikki's life in danger.

Schism: Part 2

 * With Nikki missing, Harry works against the clock to find out who is responsible for the murders and finds himself in the middle of a high-level and dangerous cover-up.

Apocalypse: Part 1

 * Harry and Nikki are first on the scene when an RAF helicopter crashes, but Harry's search for answers brings him into conflict with the Ministry of Defence.

Apocalypse: Part 2

 * Harry suspects the Ministry of Defence may be covering up the true cause of the helicopter crash, but he's determined to get to the truth.

Suffer the Children: Part 1

 * When the mutilated body of a young boy is pulled from the river, Leo is determined to give him an identity and to bring his killers to justice.

Suffer the Children: Part 2

 * Leo refuses to back down in his search for the killers of the young boy, despite threats and increasing racial tension.

Hippocratic Oath: Part 1

 * The murder of a John Doe leads the team to a hospital, where Nikki is investigating a top paediatric surgeon with an unusually high mortality rate.

Hippocratic Oath: Part 2

 * Nikki is out of action, and a theatre nurse is missing, so Harry and Leo dig deeper into the hospital deaths. Are there two killers on the loose?

Double Dare: Part 1

 * Nikki revisits an emotive case from the past when a girl she proved innocent of murder is herself murdered.

Double Dare: Part 2

 * Nikki grows increasingly worried that a mistake she made on a case four years ago may have contributed to the murder of a young woman.

Peripheral Vision: Part 1

 * When the bones of a young girl are found, everyone but Nikki is convinced it's a teenager who went missing two years ago.

Peripheral Vision: Part 2

 * Having fallen out both with both the police and Clara's family, Nikki finds herself increasingly alone in her search for the killer.

Safe: Part 1

 * Drama series about a team of forensic pathologists. Leo does community service on a rough estate after being done for drink driving. Gang violence amongst the kids there is rife, and Leo gets involved when one of them is stabbed. Nikki investigates the death of a young girl from the same area who, it seems, was murdered.

Safe: Part 2

 * Frustration within the team builds as Harry and Nikki struggle to find any useful evidence from the post-mortems to help the police. No one will talk, and they have no leads. Meanwhile, Leo worries for Levi, who is sucked further into a world of gangs and violence.

Death's Door: Part 1

 * Harry acts as mentor to Holly Farr, a young and eager medical student, who charms him into involving her in his latest case - the post-mortem of a woman found dumped on the side of the road with her face skilfully removed. Nikki is called upon to reconstruct the victim's face, and the team cannot fathom why it would have been removed in such a careful manner until Holly discovers a connection with a dangerous criminal.

Death's Door: Part 2

 * Holly discovers a link between the case of a woman found dumped on the side of the road with her face carefully removed and a Russian criminal.

Terror: Part 1

 * The team are called in to investigate an armed raid on a suspected terrorist cell. Two terrorists have been killed, together with a police officer, but when Nikki's findings point to a bungled raid with innocent lives being lost, people start to pass the buck. Fighting against hostility and closed ranks Nikki beguiles her way into the police armed response unit to try to uncover what might have gone wrong.

Terror: Part 2

 * Nikki visits the only key eye witness, Isra, the teenage sister of one of the suspects who insists that her brother is innocent. Nikki is appalled by the harshness of her treatment, and the team begin to seriously suspect that the truth is being covered up. Meanwhile, Rhys is on the run, and Harry is shocked when he discovers the identity of the unknown victim.

Judgement: Part 1

 * Harry is drawn into the murder of a Hasidic man, whose badly decomposed body was found on disused wasteland. The clues point towards a horrific anti-Semitic attack by a Polish labourer, but when holes start to appear in his wife's story, Harry becomes suspicious. Meanwhile, Leo investigates the death of a Australian backpacker at a party. The partygoers claim a drug-related demise, but she has worrying marks on her body.

Judgement: Part 2

 * When a second Hasidic boy is killed, Harry is convinced they are looking for a Jewish killer, but the police are hesitant to upset their fragile relationship with the community without any concrete evidence. When a Hasidic boy takes the law into his own hands and attacks a Polish builder, Harry makes a shocking discovery which threatens to strain community relations even further.

The Lost Child: Part 1

 * When the half-naked body of a 12-year-old boy is discovered in a ditch near his school, the team are called in, bringing Nikki into contact with one of her former teachers, now the headmaster. When signs of abuse are found on the boy's body, and one of his friends disappears, the team fear the worst. Under increasing pressure from the police, they must find clues from the dead in order to save the living.

The Lost Child: Part 2

 * As the search for Liam continues, Nikki's loyalty towards her former mentor is tested when the allegations of a former student are brought to the surface. Leo and Harry refuse to give up on the search, and they are soon on the trail of a toxic chemical, found in both bodies, which could provide them with Liam's whereabouts.

Finding Rachel: Part 1

 * When Rachel Harrington's bones are found in Zambia, her father asks the team to investigate. He doesn't believe the local police's claim that Rachel was killed by wild animals - she had been accusing the government of a health cover-up, and an initial examination shows evidence of multiple stab wounds. As the team investigate further, they discover the government weren't the only ones to have been provoked by Rachel.

Finding Rachel: Part 2

 * Nikki clashes with Zambian police as she investigates the death of a British medical student.

Intent: Part 1

 * Leo comes under suspicion for fraud when an insurance investigator accuses him of falsifying a post-mortem report, and Harry falls for the charms of an attractive former colleague.

Intent: Part 2

 * Harry puts his professional career on the line to prove his lover's innocence after Leo is attacked and Levin turns up dead.

Voids: Part 1

 * Harry and Nikki try to remain professional when they find themselves on opposite sides of a high profile case, but it's not easy as they're both brilliant at what they do, and they soon show that every piece of evidence can be interpreted at least two ways.

Voids: Part 2

 * The revelation that Flannery's first wife also died of a stair fall sends Harry to Prague to seek evidence to prove the man's guilt. However, Nikki's determination to look beyond the police's blinkered investigation leads to further tragedy.

Run: Part 1

 * Leo is concerned that the police are involved with a cover-up to protect a rogue undercover cop linked to the death of a young woman.

Run: Part 2

 * With Danielle missing and her lover on the run, Leo and the police struggle to unravel a complex web of deceit.

Shadows: Part 1

 * Nikki and Harry try to help wounded victims of a campus shooting while trapped in the building with the rampaging shooter.

Shadows: Part 2

 * Leo's post-mortem of the victims reveals there were two guns used, and possibly a second shooter.

Home: Part 1

 * When a Zimbabwean asylum seeker is unfairly deported to South Africa, Leo needs to find a way to help her return to the UK.

Home: Part 2

 * Nikki is forced to make some hard choices when she discovers that Anton has been less than honest with her.

A Guilty Mind: Part 1

 * When the team investigate three suspicious deaths in one night on the same ward, it looks like hospital staff may be behind their murders, and Nikki becomes increasingly disturbed by a rape and murder case involving a young child.

A Guilty Mind: Part 2

 * Nikki's mental instability worsens, and Harry and Leo are forced to get her psychiatric help. However, when the true identity of the murderer is discovered, it becomes a race against time to save Nikki's life.

Lost: Part 1

 * Leo is haunted by past memories when he returns to Sheffield after an ancient body is found.

Lost: Part 2

 * Leo investigates a potential copycat killing, but team wonders if Karl Bentley is wrongly convicted.

First Casualty: Part 1

 * As Nikki investigates the drowning of a young mother, Harry is called to an apparent suicide at a nearby army base; it soon starts to look like the cases may be linked.

First Casualty: Part 2

 * Having established that Lieutenant Lockford was murdered, Leo makes a startling breakthrough, and the investigation begins to unmask a dark secret at Hillsdon Army Base.

Bloodlines: Part 1

 * When human rights lawyer Anna Sandor calls Harry to Budapest to investigate the death of a client, they start to uncover a sinister underworld conspiracy, putting both their lives in danger.

Bloodlines: Part 2

 * With Harry dead and Leo and Nikki getting nowhere with the police, the pathologists struggle to clear Harry's name, while the police seem intent on covering up a wider conspiracy.

The Prodigal: Part 1

 * After a major incident at the Dutch Embassy, Harry and Nikki are removed from the case when the Dutch decide to appoint their own pathologist.

The Prodigal: Part 2

 * When the Van Buren's au pair commits suicide, the pathologists start to unravel the truth behind the Embassy shootings, and a dark family secret is exposed.

Death Has No Dominion: Part 1

 * When Leo's friend commits suicide, Harry and Nikki are called to the scene of a violent and calculated murder, which is thought to be the work of an apparently dormant serial killer.

Death Has No Dominion: Part 2

 * Harry and DI James deviate from the original investigation to secretly test DNA evidence from the rival Chesham laboratory to try to solve this stalled case.

Domestic: Part 1

 * A puzzling family murder in suburbia deeply affects Harry who has history with the family.

Domestic: Part 2

 * Harry and Nikki delve deeper into the tangled lives of the inhabitants of Magnolia Drive.

Paradise Lost: Part 1

 * Nikki is approached to help identify the paltry remains of a serial killer's undiscovered victims.

Paradise Lost: Part 2

 * Nikki is forced to confront manipulative serial killer Arnold Mears, face to face in order to save Annie.

Redhill: Part 1

 * Leo battles with the authorities at the notorious Redhill prison to seek justice for the murder of an ex-prison inspector.

Redhill: Part 2

 * While Harry and Nicky investigate DI Bridges, Leo puts himself in danger when he follows his instincts and trails violent prison officer Kessler.

Fear: Part 1

 * Leo is determined to uncover the truth surrounding the mysterious death of a young girl who was being treated by his college friend Delaney.

Fear: Part 2

 * Nikki and Harry track down the catholic nun behind the exorcism only to find that John now believes he is possessed, but can he be saved?

And Then I Fell in Love: Part 1

 * Nikki stumbles across a sinister underworld where teenage girls are groomed for sex and forced into prostitution.

And Then I Fell in Love: Part 2

 * Harry and Nikki make a crucial connection between the dead girls and sex-grooming victim Shannon, but it may be too late for Hannah and Lauren.

Change: Part 1

 * The mysterious death of a wealthy confectionery firm owner plunges Nikki, Leo and new recruit Jack Hodgson into a murky world of corporate subterfuge as they battle to prove murder.

Change: Part 2

 * When two women close to a dead business owner are murdered, Nikki, Jack and Leo open his family's skeleton-packed closet and realise the extent to which wealth and power can corrupt.

Trust: Part 1

 * The case of two young women shot dead in a house basement forces Jack to lock horns with an old flame, the ambitious DI Chrissy Reed. As the pair's animosity rapidly escalates due to their conflicting motive theories and failure to ID the victims, Nikki's probing unearths the potentially career-damaging truth behind it.

Trust: Part 2

 * As the basement women case highlights two cooperating killers, Nikki, Jack and DI Reed realise one victim was killed by a controlled sedative, stolen from a high-tech vaccine research lab. Suspicion falls on Lucas Ballinger, a scientist who works there. Meanwhile, Leo draws a blank with his theory that Shona's baby died of natural causes.

True Love Waits: Part 1

 * When a pub landlady is stabbed to death and her little finger cut off, her husband, Roly, is the prime suspect. However, as Nikki, Jack, and DI Kate Warren piece together mounting evidence, inconsistencies lead Nikki to believe Roly's innocent. She's desperate to reunite him with his traumatised daughter, Emma, who faces a life in foster care if her father is imprisoned.

True Love Waits: Part 2

 * When arrested and interrogated by DI Kate Warren, Alan Lane vehemently protests his innocent and insists he never killed his wife Imogen, but when Jack and Nikki fail to get concrete evidence in time to charge him, Lane walks free. However, when the team finally unearth the shocking truth about Imogen's murder, it exposes a web of lies and deceit which puts those connected to the case in imminent danger.

The Legacy: Part 1

 * Nikki and Jack are under pressure when a teenager's remains halt an eco-housing project, while Leo is trapped in a dangerous hospital siege as distraught Tom Hancock holds a ward at gunpoint to turn off his terminally ill son's life support. Leo agrees to do his son's post-mortem to diffuse the situation, and becomes embroiled in Tom's quest for the truth behind his son's cancerous tumours.

The Legacy: Part 2

 * Whilst Nikki and Jack close the net on Brian Blackburn's troubled son for murdering his co-worker at the eco-housing project, Leo finally finds someone willing to confirm his fear about the mysterious local health hazard. When his would-be-informant is found murdered, Leo is convinced he was the victim of a government conspiracy to conceal the truth.

Greater Love: Part 1

 * British Army Corporal Scott Lambert requests Leo's expertise in identifying human remains unearthed in Afghanistan, believed to be those of his brother Daniel, who went missing in action five years ago, suspected of being captured by the Taliban. Anxious Leo, Nikki and Jack head for the war-torn country in search of the truth about the soldier's mysterious disappearance.

Greater Love: Part 2

 * British Army Corporal Scott Lambert requests Leo's expertise in identifying human remains unearthed in Afghanistan, believed to be those of his brother Dan, who went missing in action. Nikki, Jack and Leo struggle to identify the human remains with only sections of skeleton found and basic forensic facilities, but believe Dan must have been captured by the Taliban, executed and buried.

Commodity: Part 1

 * A sex tape puts top-flight footballer Isaac Dreyfus in the frame for murder, while new Lyell Centre boss Thomas struggles to impress Nikki, Jack and Clarissa.

Commodity: Part 2

 * A bereaved husband and father seeks revenge for the murder of his wife and son, while Nikki questions footballer Isaac's motive for murdering a young woman.

Coup de Grace: Part 1

 * When Nikki's courtroom testimony frees a convicted killer, a new murder sees her lock horns with the unforgiving DI Rachel Klein, the detective who originally imprisoned the killer.

Coup de Grace: Part 2

 * Thomas and Jack's worst fears are realised when Nikki and lawyer Greg Walker are held hostage by Bennetto in a dangerous armed siege.

In a Lonely Place: Part 1

 * Nikki and Jack head up to Scotland to investigate the violent murder of a young woman found in a remote Scottish forest.

In a Lonely Place: Part 2

 * After more female bodies are found in the Scottish forest, Nikki and Jack fear the serial killer may strike again.

Undertone: Part 1

 * The murder of a young woman found in a suitcase leaves Nikki, Jack and Thomas in a race against time to catch her killer.

Undertone: Part 2

 * Martin, the sole eye-witness in the murder case, is found dead in suspicious circumstances; and Jack clashes with DI Brooke as he and Nikki hunt for the missing baby.

Fraternity: Part 1

 * The shocking discovery of a 15-year-old girl's body sees DI Dale Carter fixate on his prime murder suspect Ryan Kelvin. However, Jack's personal connection to Ryan presents a conflict of interests, leading Thomas to replace him on the case.

Fraternity: Part 2

 * Jack's loyalties to his brother Ryan and the Lyell Centre team are torn when Hannah is found dead, forcing him into a dangerous solo quest for the truth.

Sniper's Nest: Part 1

 * DCI Jane De Freitas's personal fallout with boss and partner Chief Superintendent Robert Drake is the least of her worries when three people are shot dead in a petrol station.

Sniper's Nest: Part 2

 * Nikki and Jack look closer at the targets to elucidate the hidden motive of the killer. The investigation is scaled up by DCI Jane De Freitas, but it's Jack's shocking discovery at one of the victims' homes that leads the team to the perpetrator.

Falling Angels: Part 1

 * Nikki and Jack investigate a man run down and killed by a tube train. When a female vicar is then murdered after being followed on the underground, the team face the difficult prospect of building a case against her distraught husband.

Falling Angels: Part 2

 * Tension on the tube network threatens to boil over, and security is stepped up. The accidental verdict in the first death is called into question and the witnesses are brought in. Nikki helps Nelson unearth the mystery of his father's death.

Protection: Part 1

 * When Dale Barge is found dead in a playground, Nikki and Jack soon face the alarming prospect that his murder is linked to the disappearance of a little girl, Lizzie.

Protection: Part 2

 * Social worker Louise fears the worst when Daniel Garvey, the estranged step-father of teenager Kevin, whose case she managed, is found dead in his car.

Squaring the Circle: Part 1

 * A shootout at a City hotel leaves young Ukrainian nanny Sofia Teplov dead, along with an unknown hitman. The Russian oligarch target Maksim Bazhanov narrowly escapes.

Squaring the Circle: Part 2

 * A young woman working for the Doshi property moguls, Amy Greenwood, is found dead in Maksim Bazhanov's apartment, and Maksim is discovered to have been in a relationship with Yasmin Doshi.

One of Our Own: Part 1

 * Admired Essex police officer Sergeant Sam Honeywell is found dead in his car and the police put huge pressure on the Lyell team to catch his killer.

One of Our Own: Part 2

 * When the body of local wide boy, Jason Simons, is found dead in suburbia, his brutalized body reveals secrets that challenge his identity and the course of the case.

After the Fall: Part 1

 * Nikki arrives at a murder scene to find it's the carbon copy of a case in her past. She soon fears the killings are personal to her. But who will believe her and who can she trust?

After the Fall: Part 2

 * Nikki becomes the prime suspect after a former colleague is murdered. Jack, Thomas and Clarissa fight to clear her name and find the real killer.

Flight: Part 1

 * A young British Muslim secretly returns to the UK. Although initially suspected of drug smuggling, soon something much more sinister is feared.

Flight: Part 2

 * Thomas must put his personal feelings aside as the team track down Begovic before she and her extremist compatriots strike out again.

Life License: Part 1

 * When an ex-convict is found brutally murdered in his home, the Lyell team is introduced to Sasha Blackburn, a forensic psychologist who works closely with those released from prison on life licence. The victim was a client of Sasha's, and so is one of the suspects: Paul Raynott, a vulnerable young man trying to turn his life around with Sasha's help.

Life License: Part 2

 * After the team discovers that suspect Paul may not be who he says he is, and was involved in an infamous murder in the past, the investigation revisits the fifteen-year-old case. Wounds are re-opened for the family of the victim as Paul's psychopathic accomplice in the historical murder is visited in the hope that he can shed light on the current investigation.

In Plain Sight: Part 1

 * The accidental fatal shooting of a Polish teenager in an armed police operation triggers a series of murders that link Turkish gangsters, a grieving family and a fractured firearms unit.

In Plain Sight: Part 2

 * Jack leads the hunt for suspected killer Bruno, the brother of the Polish teenager shot by the armed police, and enters London's small but devastating gun trade.

River's Edge: Part 1

 * A family murdered at a picnic leads the team to the female victim's estranged husband, but all is not what it seems, and Nikki and Jack are thrown into mortal danger.

River's Edge: Part 2

 * Nikki and Jack are thrown into mortal danger as they uncover a high-powered world of sex and depravity. Meanwhile, Amy confronts her past.

Identity: Part 1

 * When a people smuggler is found dead in the city, Nikki delves into London's illegal immigrant community. She meets a vulnerable Syrian teen called Akka who is in need of help, putting Nikki in a moral dilemma, and the killer is still on the loose.

Identity: Part 2

 * When Nikki, Jack and Thomas make a horrific discovery in the van, they're confronted with the work of a killer who preys on illegal immigrants. With the help of Clarissa, they must work out where the killer will strike next before more vulnerable people meet the same fate.

Discovery: Part 1

 * Nikki and Jack are at the centre of a media storm when a photogenic schoolteacher disappears. Meanwhile, Thomas fights a lone crusade for justice for a troubled young woman who was killed in puzzling circumstances.

Discovery: Part 2

 * Having found a link between the two cases, the team struggle to make sense of it. Nikki visits a disgraced former colleague who may hold the key, and Thomas uncovers the bizarre truth about how Tina died.

Remembrance: Part 1

 * A woman's body found floating in the Thames leads Nikki and Jack to a community on the banks of the River Lee. Three years ago a teenager called Ruth Tresize went missing from the area, leaving the locals haunted by suspicion and grief. A fresh spate of killings reopens these old wounds.

Remembrance: Part 2

 * After bereaved mother Ali attacks suspect Aaron, Nikki is under fire for leaking information. Jack and Thomas must bridge internal divisions to track down the killer.

Covenant: Part 1

 * When an East End father and son are killed in a shocking road accident, Nikki and Jack find themselves working alongside a police officer with a vendetta. Clarissa summons her husband Max, a digital forensics expert, to help crack the case, and uncovers disturbing video evidence.

Covenant: Part 2

 * Nikki helps Becky come to terms with her trauma. Also, Jack is paranoid that Clarissa will leave the Lyell Centre, and Paul is in way over his head.

Awakening: Part 1

 * Nikki travels to Mexico when her friend is killed in a carjacking. She soon makes a discovery that sets her on a collision course with some dangerous and unpredictable forces. Also, Thomas sends Jack to bring Nikki back, but soon he is knee-deep in the unfolding situation.

Awakening: Part 2

 * With Nikki locked in a struggle for survival, Jack must use all of his abilities to track her down. When a mysterious person calls to make demands in return for Nikki's release, Jack's moral principles are put to the test.

Moment of Surrender: Part 1

 * Haunted by her experiences in Mexico, Nikki struggles to come to terms with life back home, and she seeks out fellow pathologist Sally Vaughan for support. A few days later, troubled by the failure of Sally to return her calls, Nikki heads over to her house only to find that it has become a crime scene and Sally is nowhere to be found. As Jack, Clarissa and Thomas share concerns about Nikki's wellbeing, a body is found in a reservoir, uncovering the mystery of a 16-year-old murder case.

Moment of Surrender: Part 2

 * Nikki's suspicions over David Cannon are aroused further when she discovers blood in the boot of his car. With Thomas's support she takes samples to process. Does it belong to Sally Vaughn? The uncovering of a family murder from the past shines the spotlight on three people who went to the same school.

Duty of Candor: Part 1

 * Nikki and Jack continue to deal with their feelings post-Mexico in their own very different ways. Jack is boxing with his sparring partner Naomi Silva when he is called to a crime scene. Nikki examines the body of a young woman.

Duty of Candor: Part 2

 * The team wonder if the cyber hack is the only danger as they come under threat: Nikki receives a threatening text with a picture of Rosie and the ominous message `lose the evidence'. Jack must decide how to get closure from his experience in Mexico.

A Special Relationship: Part 1

 * A US Diplomat is shot dead in a central London square, forcing the team to work closely with the Embassy and the FBI. When a second US citizen is targeted, what looked like a lone wolf attack could now be a focused terrorist attack against the US.

A Special Relationship: Part 2

 * While analysing pictures of the crime scene and the positions of the bodies of the victims, the team discovers a secret that reaches the pinnacle of the American government.

One Day: Part 1

 * Two care home staff, Patrick Flannery and Tillie Maddox burst out of Kingscote Bows Residential Care Home chasing Kevin McDowd, a young man with learning disabilities and sociopathic tendencies. Some distance away Nikki and Jack examine a fatal road accident, the deceased is Kevin McDowd's mother. Was it an accident?

One Day: Part 2

 * The team are determined to uncover the truth about unexplained deaths of patients at a care home, and they are desperate to rescue Serena and return her to safety. Unbeknownst to her colleagues in the Lyell Centre, Clarissa allows herself to be admitted to the care home in order to investigate. Her determination to find out the truth about the events going on at the care home leads her to uncover a shocking truth, but puts her life in danger.

Family: Part 1

 * It's Christmas morning and the team get a call after the discovery of a family massacre at an enormous property owned by the CEO of a haulage company. A gunshot suddenly rings out, and the team speedily realise that the shooter might still be there.

Family: Part 2

 * With the conclusion of a rather challenging Christmas, the team are reunited with their respective families, but Nikki is shocked to learn that her colleagues have all pitched in to buy her an open return ticket to see Matt in the States. Will Nikki stay in the US with Matt or choose to return to Lyell Centre?

Two Spirits: Part 1

 * Fresh from her trip to the US, Nikki and the Lyell unit are called to investigate an attack against a transgender man. When two further attacks are reported, one leaving a potential witness, it looks like the team are facing an outbreak of violence.

Two Spirits: Part 2

 * A mistake has been made during the course of the investigation and Thomas is targeted as a scapegoat. As frustration grows between the Lyell and the acting DCI, Thomas must rally the team to gather crucial evidence before the killer strikes again.

Lift Up Your Hearts: Part 1

 * After a teenage boy is killed in a meth lab explosion, his head teacher resolves to confront the drug dealers preying on his community. Dangerous batches of new drugs are hitting the streets, and the effects are evident to Nikki, Jack, Clarissa and Thomas, as they deal with the rise in both violent and accidental deaths.

Lift Up Your Hearts: Part 2

 * DI Kate Ashton leads the investigation into a gang of dealers recruiting young men to push drugs near a London school, and as well as tracking down those responsible for the recent deaths, she also seems keen to pursue a relationship with Jack.

To Brighton, To Brighton: Part 1

 * During a heatwave in Brighton, the Lyell team are summoned to a waste dump where a body part has been found. The search is on to recover the other dismembered remains and piece together the victim's body, which is covered in unusual tattoos.

To Brighton, To Brighton: Part 2

 * With the remains of a second tattooed victim appearing in a Brighton recycling plant, it seems the Lyell team are on the trail of a serial killer. Working closely with local detectives, they must painstakingly piece together the evidence.

Death Maker: Part 1

 * A shocking incident on a suburban street brings back painful memories for Jack, forcing him to revisit his past. As a member of the victim's family seeks justice of their own, forensic evidence discovered by the Lyell team suggests the involvement of a Northern Irish terror group, long thought inactive.

Death Maker: Part 2

 * In the team's search for the killer, Jack works alongside an old friend from Northern Ireland, a fearless journalist who has dedicated her life to exposing the suspected organisation. As the team investigate further, they realise they have uncovered a complex conflict sustained by ties of loyalty, family and retribution.

Betrayal: Part 1

 * Nikki is humiliated in court when a barrister accuses her of making a serious error in the case of a policeman who may have been murdered. Meanwhile the team investigate the death of a medical researcher, found in a canal with mysterious puncture marks on his body.

Betrayal: Part 2

 * When Thomas sides against her findings on a controversial case, Nikki suspects foul play and takes steps to prove her theory. Meanwhile, Jack and Clarissa follow a forensic trail connecting the dead researcher with a billionaire scientist and a secret testing program.

Deadhead: Part 1

 * A private jet crashes into woodland outside London. Its passengers include the former US Ambassador, Jonathan Kraft. Nikki calls her partner Matt from the crash scene to break the news, his friend, and former colleague did not survive the accident. Matt is desperate for answers. When Thomas is called to an apparent suicide of a successful businessman, he finds unexpected connections to the plane crash.

Deadhead: Part 2

 * Nikki and the Lyell team continue to investigate the plane crash, ruling out an explosion and engine failure. Suspicion turns to Rowan Cole, the so called Deadhead, a non-flying pilot who was hitching a lift back when his intended flight was cancelled. The investigation takes a turn when they discover a connection to a sinister online forum. Nikki's partner Matt is grieving following the death of his close friend, putting their relationship under strain.

Close to Home: Part 1

 * When a body is found in a field near the village of Hartford, Nikki and the Lyell team confirm it is that of missing teenager Jason Forbes. Working to the theory that most killers strike close to home, the ambitious DCI Claire Ashby is committed to proving the guilt of her main suspect, local locksmith Malcolm Wilde.

Close to Home: Part 2

 * Investigating the murder of a teenage boy, Nikki and the Lyell team are forced to question police methods. When Thomas discovers evidence that throws the time of death into doubt, DCI Claire Ashby seems more concerned with building the case against her main suspect. With pressure building on the police to secure a conviction, the team must fight to ensure that inconvenient truths aren't overlooked.

Seven Times: Part 1

 * The body of a woman is found on train tracks in London, badly damaged from electrical burns. On the mortuary slab, the woman's recent and historic injuries suggest years of abuse, likely within the home. It's a difficult post mortem for Nikki, as she is troubled by memories from her childhood.

Seven Times: Part 2

 * Nikki determines that Jenny must have died before making contact with the tracks. But when the search for Jenny's killer hits a wall, her friends at the women's refuge seek answers. Meanwhile Thomas's political ambitions lead him to make friends in high places.

Hope: Part 1

 * Teenagers messing around in a stolen car collide with a concrete pillar in a multi-story car park. The joyriders escape, but within the smashed concrete, the unmistakable form of a skull is revealed. After painstakingly extracting the skeleton encased inside, Nikki and the Lyell team must investigate a suspicious death from 20 years ago. Meanwhile Clarissa faces a difficult decision regarding her mother's care.

Hope: Part 2

 * The Lyell team identify the concrete-encased remains as those of Derek Marshall, survived by his wife Sue and sister Ann. Clarissa traces payments to a cryogenics facility, leading to the discovery of another suspicious death. Lacking any proper documentation, the coroner orders a post mortem into the cryogenically frozen body.

The Greater Good: Part 1

 * Thomas investigates the case of John Sealy, a soldier who died during a military training exercise involving exposure to CS gas. It appears John died from an aneurysm, but when Thomas discovers the trace of a possible nerve agent in his system, the family are desperate for answers.

The Greater Good: Part 2

 * Jack is rushed to a hospital after collapsing at the scene of a car crash; as Jack fights for his life, the team must identify the poison to save their friend.