When a woman’s body is removed from a reservoir, Nikki performs the post-mortem and confirms she is the deceased wife of pathologist Charles Beck. Jack and Velvy discover new evidence that leads to a surprising arrest as Nikki continues to seek the truth about notorious serial killer Calvin Dunn.

Nikki continues to try and identify the last of the remaining bodies in an effort to uncover any connections and find motive, while Jack and the police begin to look into several two-decade old missing persons cases which might reveal the identity of the man dubbed “The King’s Cross Serial Killer”.

A new murder victim forces the team to consider whether a notorious serial killer has resurfaced after 20 years, or if they are dealing with a copycat.

The Lyell are called to a museum outside King’s Cross Station, where they discover the bodies of eight victims entombed below. With the knowledge that a prolific serial killer was operating in London nearly twenty years ago, Nikki and the team know this will be a case like no other.

The death of an elderly woman found in a cave has the Lyell team asking what drives a person to murder someone so vulnerable. A new boss at the Lyell riles Jack.

Benjamin continues his desperate search for Gloria. Nikki’s disturbing discovery joins the dots. A new team member joins the Lyell.

After another hammer attack, the Lyell team start uncovering connections to a conspiracy involving local government.

When a mysterious contagion starts to spread on a flight from Mumbai, Dr Nikki Alexander faces a race against time - at 30,000 feet - to contain a deadly illness.

When more passengers become infected on the plane, Nikki and the Lyell team must work to uncover the truth and find a cure before it’s too late.

The Lyell team investigate another gruesome murder, and the identity of the shooter at the restaurant leads to an unsettling discovery.

When tragedy strikes close to home, it puts head teacher Noah Taylor on a collision course with the criminals responsible. Can the Lyell team help him stop the cycle of violence?

The team work a suspected suicide but the investigation raises more questions than it answers. Gabriel has an exciting new opportunity, both professionally and personally, and enlists Jack’s help. When a disgruntled professor of criminology is passed over for promotion, events take a truly sinister turn and the interview panel begin to be targeted. Could a member of the Lyell be next?

Events continue to spiral at the university and Cara becomes collateral damage. The riddle of the body in the Thames is solved. A breakthrough in the Cherry case is received from an unlikely source, but will the team get there before it is too late?

The team investigate the death of a Burmese man on a deserted beach, as his young pregnant wife desperately hopes he is still alive. Nikki and Jack piece together the perplexing crime scene and find it poses more questions than it answers.

Nikki makes a breakthrough but can the team believe everything they are told? The Lyell is compromised in an unexpected way, as the team strive to find out who the man on the beach was and why he was killed. In a dark and chilling story, they must unite to discover the truth, and above all, trust no one.

Dismembered body parts take Nikki into the crumbling world of criminal justice. Can the Lyell team find a missing barrister before it’s too late?

When six people are slaughtered by an unknown gunman, Nikki and Jack must work against the clock to find the shooter. Can they find him in time before he kills again?

Having traced Laura’s last movements to a suburban house, the team work to identify the bodies buried in the garden. Meanwhile, Jack must choose between his brother and the truth.

With their suspect in a coma and an attacker seemingly at large in the hospital, Nikki calls on Adam’s expertise to help solve the case.

The team investigate the body of a woman found in a flat after being dead for a year. As they seek to find out the truth of her identity and what happened to her, they must draw on all of their forensic and pathology knowledge to solve the case. Even if the world had forgotten her, the Lyell are determined that she must get justice.

Nikki and Jack work to uncover the truth surrounding Roy’s death and consider if it’s linked to their original body. Meanwhile, D.I. Torres searches for a stalker and Cara is shocked at Velvy’s living conditions. As the case comes to a head, there are surprises afoot for the team.

When a man is found bludgeoned by a hammer, the Lyell are drawn deep into a conspiracy involving local government.

Nikki conducts an unusual post-mortem, and a terrifying discovery disturbs the team. DNA evidence forces the Lyall to seek advice from an unexpected quarter.

Leo investigates a potential copycat killing, but the team are starting to wonder if Karl Bentley was wrongly convicted, leaving the real murderer free to set out on a new killing spree.

Nikki helps high-flying DI Luke Nelson unearth painful childhood memories.