Desperate to be free from her drunken, unloving mother Diane, the beautiful, scheming young Mini seduces her stepfather Martin and soon convinces him to join her in a sadistic scheme to have Diane declared insane. But their conspiracy soon escalates to murder and when John Garson, a young detective starts investigating, Martin and Mini begin to turn on each other.

Riding around on their motorbikes, a gang of tough women bikers are the only thing that stands between a crowd of zombies, which have been accidentally let out of their secure cave, and those still alive in the town.