While on Christmas break, three college girls go missing from their rural hometown of Kelly's Falls. As the investigation grows cold, 23-year-old Buffalo police officer Shea O'Connor is called on to dig up leads undercover as a college freshman and the "niece" of the town's police chief. As she begins to immerse herself in the missing girls' world, 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.