Nine months after bringing their adopted daughter Angelina home, Jack and Melissa McGuane receive a devastating phone call from the adoption agency: the birth father, a teenager and son of a powerful Denver judge, never signed away his parental rights, and he wants Angelina back.

When two sisters set out across a remote stretch of Montana road to visit their friend, little do they know it will be the last time anyone might ever hear from them again. The girls-and their car-simply vanish. Former police investigator Cody Hoyt has just lost his job and has fallen off the wagon after a long stretch of sobriety. Convinced by his son and his former rookie partner, Cassie Dewell, he begins the drive south to the girls last known...