A surly waitress and an introverted pastry cook meet at the restaurant where they both work. The waitress persuades the man to give her a ride home. In the torrential rain, they accidentally run over a female hitch hiker. The waitress finds that the sight of blood on the dead girl's body turns her on and she makes violent love to the man. Having discovered that death and bloodshed are their mutual aphrodisiacs, the pair embark on a rampage of murder and mutilation. Soon the violence escalates until it seems that nothing can stop them.
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