While Cambridge police detectives interview witnesses who may or may not tell the truth, 'Sam' extracts revealing truths from calcified bones, decomposed and charred bodies, tell-tale bruises and overlooked fingerprints. Brace yourself for twists and turns in four gripping episodes: the suspicious drowning of a six-year-old girl, the apparently ritual killing of a young man, a death in police custody, and the fiery murder of a refugee's business partner....

Former colleague Sam Ryan calls upon the team after the health secretary is assassinated, but as the investigation progresses, Nikki fears uncovering the truth will put the entire Lyell team in danger. Meanwhile, murders continue to happen, and each case seems to carry with it a secret from each team member's past.

Dr Nikki Alexander and the team of forensic pathologists and scientists at the Lyell Centre investigate intriguing new cases: a body falling from the top of a skyscraper, a people trafficking operation, a suspicious death at a festival, a train crash, and corrupt police officers. The cases that end up at the Lyell Centre are rarely straightforward. Initial suspicions are challenged as the evidence mounts and Nikki and the team must work harder than...

If the living told the truth, forensic pathologist Dr. Samantha Ryan wouldn't have to spend so much time examining the dead. The living want us to believe that an Asian boxer died of a fatal blow in an exhibition fight, an AIDS sufferer died of AIDS, a young woman was stabbed by her jealous husband, and an old woman was beaten to death by a violent alcoholic. But the dead tell different stories with their grim clues.

A team of forensic pathology experts investigate various crimes.

Follows the work and personal lives of forensic pathologist Dr. Samantha Ryan and her police colleagues as they investigate four murder cases in and around Cambridge, England.