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A notorious gunslinger is slipped a slow-acting poison by an heiress and told he has three days to track down and rescue her sister, who has been kidnapped by a gang of hoodlums and holds the antidote.
An estranged family take a trip to the desert in their used RV and become stranded and isolated in the scorching terrain. They soon learn their RV holds terrible, haunting secrets, and it starts killing them off one by one.