Doctor Claire moves with her son to a quiet resort town to escape her past and starts a private practice there. But soon hopes for a peaceful life collapse: one of Claire’s patients—a fourteen-year-old boy—commits a terrible crime. And this is only the beginning of a chain of inexplicable outbursts of aggression among local teens. They want to kill, and their rage turns against their loved ones… As it turns out, these cases happen here regularly—twice in a century. Claire realizes that children are driven by something more than just rebellion and a thirst for destruction. There must be a biological cause for such abnormal behavior, she reasons—and step by step moves closer to the incredible truth, despite unambiguous warnings and threats…