Husband and wife Rob (Robert Taylor) and Pia's (Nadia Farès) weekend boating idyll quickly turns into a holiday nightmare when the weather turns bad and their craft gets lost in the storm, landing them in a desolated swamp. Seeking refuge in a dilapidated house, the couple's problems only worsen when the owners -- hillbilly rednecks with a barn full of marijuana -- return and proceed to enslave and humiliate them.