Two sisters set out across a remote stretch of Montana road, and it is the last time anyone hears from them again. Cody Hoyt, who has just lost his job as police investigator, begins the drive south to the girls’ last known location. Meanwhile, his former rookie partner, Cassie Dewell, discovers that Gracie and Danielle Sullivan aren’t the first girls who have disappeared in this area. This majestic landscape is the hunting ground for a killer whose viciousness is outmatched only by his intelligence.