An altercation between a group of girls out for the night and a gang of local punks leaves the punks vowing revenge . . . . . that revenge starts with the vicious gang-rape of a young mute girl called Heather (Linnea Quigley) . . . . then her older sister, Brenda (Linda Blair), starts hunting the gang down one by one. . . . Armed with bear traps and crossbow she makes them all pay . . .