Still reeling from the sudden death of Dr. Thomas Chamberlain and the shock departure of colleague Clarissa Mullery, Nikki and colleague Jack Hodgson returns to the Lyell Centre. A case at a high-security prison stirs disturbing memories for Nikki. Recruit Adam causes friction with his impetuous desire to impress. Forensic ecologist Simone's unique knowledge helps solve the murder of a promising young boxer. And Nikki suspects a body donated to medical science may not have died from natural causes after all.