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Shayne, a mini-skirted cyclist, decides to break up the marriage of her ex-boyfriend, rodeo star Jeff Logan, by terrorizing the newlyweds. Accompanied by her younger sister, Edie, and a group of Jeff's former cronies, Shayne descends on the trailer where Jeff and Connie are honeymooning. Jeff drives the mob away with a gun and moves to a new locale; and in the course of the chase that ensues, the wildly swinging trailer knocks one of the cyclists over a steep cliff. Shayne, goaded on by the sadistic Lon, now becomes more determined than ever to have her revenge. Edie, however, feels that the escapade has gone far enough, and she exchanges clothes with Connie and takes her place in the trailer while Jeff and Connie make their getaway on foot. The half-crazed mob hurl Molotov cocktails into the trailer, and Edie is burned to death. Blaming Jeff and Connie for Edie's death, Shayne and Lon attempt to run the couple down, but Lon crashes over an embankment and is killed while Shayne topples over a cliff and is left hanging by one hand. For a moment Connie feels compassion and goes to her rescue. But, remembering the past few hours, she releases her grip on Shayne and allows her to drop into the chasm below as Jeff arrives with the police.