Four friends, 11 years after a major falling out, reunite on a final mission:to find Yaeli, the former lover of one man and sister of another. Can the

故事发生在一个小镇高中,在某个普通的早晨,戴面具的不明人士冲进学校展开屠,杀,造成四名学生死亡。警察赶来调查此事后,得出的结论是凶手并不是外来人员,421名学生和老师里隐藏着真正的凶手。