After barely escaping a confrontation with an unbalanced killer obsessed with her mother's murder, Cassie hopes she and the rest of the team can stick to solving cold cases from a distance.But when victims of a brutal new serial killer start turningup, the Naturals are pulled into an active case that strikes too close to home: the killer is a perfect copycat of one of their incarcerated fathers - a man he'd do anything to forget. Forced deeper into a murderer's psyche than ever before, will the Naturals be able to outsmart his brutal mind games before he twists them into his web for good?