Gail Hartman is facing problems with with her husband, the workaholic architect Tom. On their son Roarke's birthday, Gail decides to leave their, Willa, daughter with her parents and take her family to raft down a wild river where she was a guide. On the departure, a young man named Wade befriends Roarke and leaves the place with his friends, Terry and Frank. Later the Hartmans encounters Wade and Terry, who do not have rafting experience, and Gail helps them to cross a whitewater. They get closer to the Hartmans, who soon learn a dark secret about them. What will they do to get rid of them?
