When a middle-aged man is brutally murdered in the hills overlooking a children's pool, it is immediately clear to Sergeant Jill Jackson that someone has stopped a dangerous pedophile in his tracks. Jill is at first ambivalent about pursuing the killer, but when more men die—all of them known to police as child sex offenders—she is forced to admit that a serial killer is on the loose. As the investigation deepens, Jill unearths a long-established pedophile ring, a club of wealthy men who have thought until now that that they were untouchable. As she faces predators and their victims, a psychotherapist losing her mind, and her own nightmares come to life, Jill is forced to decide whether or not she really wants to catch this killer.