Nikki is furious with Leo when he re-examines a child abuse case by her former mentor, leading to conflict between the pathologists. But she soon has more to worry about when a workman at the centre reveals how his mother is being manipulated by a convicted serial killer into searching for his hidden teenage victims. As the team tracks down the detective who originally worked on the Arnold Mears case and examine the church he visited as a boy, the killer is furious that the police have been made aware of the undiscovered bodies. Eventually, he agrees to talk, but only to Nikki. Can she outwit the scheming convict and compel him to reveal the whereabouts of the corpses - and Annie?