Twelve years ago, a teenaged girl named Janine Elston was shot while she slept in her bed. Her father, a former cop, goes to Cold Squad to ask for help when Wayne Corby, the man who was believed to have killed her, is about to be released from jail. Since Corby was never charged with Janine's death, he could still be held responsible.
Christopher Gerald Williams was ten when he was taken from the bedroom he shared with his seven-year-old brother Joey in 1977. Twenty years later when another body is found, Tony realises that David Sawyer was killed in a way very similar to young Christopher, and Ali joins forces with Iredell to uncover the killer. After doing DNA tests, the squad realises that the same man killed both boys, and they begin investigating Victor de Jarre and Jacob Knewling, who were suspects in the first investigation. Ali tries to get what she can out of Christopher's now-grown brother Joey, who has become an alcoholic.