The teacher Gail Hartman is facing problems with her marriage with her husband, the workaholic architect Tom Hartman. On the birthday of their son Roarke, Gail decides to leave her 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 family encounters Wade and Terry, who do not have rafting experience, and Gail helps them to cross a whitewater. They get closer to the family and soon Gail and Tom learn a dark secret about Wade and Terry. What will they do to get rid of the men?