Still bearing the emotional and physical scars of a previous case, O'Connor infiltrates as eighteen-year-old Shea Anderson, a college freshman and the "niece" of the town's police chief. As she begins to immerse herself in the missing girls' world, befriending their friends and family, and doing whatever it takes to maintain her cover, O'Connor realizes the track is far colder than she initially thought. But whoever was behind the girls' disappearance was only warming up, and they have set their crosshairs directly on her.