Donna Keppel (Brittany Snow) has survived a terrible tragedy, but now the time has come to leave the past behind and celebrate her senior prom in style.

• 三年前，当娜（布坦妮史诺饰）亲眼目睹一名丧心病狂的凶徒（尊尼芬史基治饰）把她全家每一个人杀死；