大毛（吴镇宇 饰）发现他与朋友们牙丫（钱嘉乐 饰）、番茄（雷宇扬 饰）与小云（黎姿 饰）一起开的的便利店里面有些不寻找的事物。但朋友们面对大毛的表述，都觉得只是大毛的迷信看法，都随便敷衍了事，大毛深感无奈。

大毛（吴镇宇 饰）发现他与朋友们牙丫（钱嘉乐 饰）、番茄（雷宇扬 饰）与小云（黎姿 饰）一起开的的便利店里面有些不寻找的事物。但朋友们面对大毛的表述，都觉得只是大毛的迷信看法，都随便敷衍了事，大毛深感无奈。

　　大毛刚认识的警察陈查礼（黄子华 饰）从母亲（罗兰 饰）那里得到了些民间的驱魔辟邪的方法，同时也发现朋友们的举动十分古怪。在查礼的调查之下，才发现了这间便利店背后的故事。

　　当他们听到这个故事后，都不寒而栗，深怕事情同样发生在他们的身上。到底，在这间店的背后，发生了什么令人心寒的故事呢？

A spirit who haunts the unsuspecting customers of a 24-hour convenience mart. When clerk Mo tai-ho starts hearing Peking opera coming out of the telephones, the freezers and from the backroom, he's sure he's going nuts. The fact that he is daily troubled by dreams dominated by a hideous ghoul isn't helping much. The sole person who believes him is a lonely cop named Charles Chan, whose mother is an expert on such poltergeists and who recommends the urine of a child or the tail of a black dog to stop such visitations. Both options fail when the ghost forces Mo to drink the kid's pee and neither have the heart to mutilate a puppy. Desperate, they call on the help of a Taoist master, who proves to be no match for the spirit. Will this lowly convenience store clerk manage to overcome his supernatural foe?