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一场阴差阳错的谋杀案，牵连了一栋大厦里多个无辜的人。 　　失恋女（莫文蔚饰）在七月半被男友抛弃，于是把自己关在房里，不断往楼下扔东西发泄。两个心怀鬼胎的保安也在此时酝酿打劫大厦的计划。一对夫妇突然间不见了儿子，遂请求保安队长（李力持饰）帮忙。队长进入二人家中却发现了另一桩与死去老妇有关的凶案。而此时失恋女发现了站在楼道口对着一盆花说话的神秘黑衣人（周星驰饰）。队长发现了夫妇谋杀老母亲的事实，遂被追杀。而此时老母亲的鬼魂前来索命终被黑衣人制服。而夫妇也最终被黑衣人制服后坠楼身亡。含恨的厉鬼就要来索命，牵连该事件的若干人无奈之下只有与神秘的黑衣人合作......

The film follows five teenagers who are stalked by a killer in the woods. However, when the killer accidentally dies, they realize they're trapped in the storyline of the movie and cannot leave until they fulfill its script. This darkly comedic and thrilling take on the horror genre turns the typical slasher trope on its head.