With limited resources, Jay and the police continue to dig into Nilsen's memories in an effort to identify and convict him for the murder of every one of his victims. But when Des suddenly withdraws his cooperation and stops talking to the police, Jay fears justice will be lost.Meanwhile, Des confides increasingly in Brian, which proves a unique obstacle for Jay, who has never had to deal with a criminal biographer before. As Brian's sessions give Des the opportunity to analyse and confront the possible reasons for his crimes, he considers the prospect that he may not be guilty of murder after all.