A group of friends get stranded in a seemingly deserted small town and find themselves stalked by a violent gang of psychopaths dressed as clowns.

Charles has purchased a vintage RV with the hopes of taking his family on a road trip to reconcile with his two sons, a promise he made to his wife before she recently passed. His oldest son, Steve, his wife Jennifer (Denise Richards), their daughter and family dog, are excited for the excursion, however, his youngest son Jay is less than enthusiastic. Along the way, the family picks up Samantha (Mischa Barton) and her brother, broken down on the side of the highway. Before they get them to a service station in the next town, however, Charles insists on taking a detour into the desert to visit a landmark and they soon get lost. Now stranded in the desert, the unsuspecting group is blindsided by the terrible secrets they discover within the walls of the RV and find themselves in the fight of their lives.