When teenagers Danielle and Gracie Sullivan take a car trip to visit their friend in Montana, little do they know it's the last time anyone will ever hear from them again. The girls and their car simply vanish. Cody, who's just lost his job and has fallen off the wagon after a long stretch of sobriety, is in no condition to investigate. But his son Justin, who the girls were going to visit, and his former partner, Cassie, convince him to drive south to their last known location.