兰桂坊是男女午夜寻欢作乐的地方，流传着夜场无真爱的潜规则。本片主要讲述了四段夜场爱情故事。Rain（关楚耀 饰）是一名摄影师，在夜蒲与富二代的Summer（连诗雅 饰）一见倾心，陷入热恋，然而Rain逐渐感受到了二人生活的差距，而Summer老爸和前男友的百般阻挠更让这 对恋人的感情倍受挑战。Avis是个普通的马仔，每天下班后陪老板来夜蒲玩乐，对终日被人欺负的私钟妹QQ（陈静仪 饰）心生怜爱，和老板大打出手，让QQ备受感动。Don（沈震轩 饰）是夜场高手，终日在夜蒲寻觅一夜激情。一次慌忙中拿错了别人的手机，开始通过手机和火辣性感的机主Siri（刘羽琦 饰）调情，约会。阿辉是一名普通的巡警，负责夜场周围的治安，和夜场DJ Maxim误会消逝后互生好感，用着折纸的方式来互通情谊…
Walking home from work one night, Thana, a mute seamstress in New York City's Garment District, is raped at gunpoint in an alley by a mysterious, masked attacker. She survives and makes her way back to her apartment, where she encounters a burglar and is raped a second time. Thana bludgeons this second assailant to death with an iron. She then keeps his .45 caliber M1911A1 pistol, dismembers the burglar's body, puts the pieces into plastic garbage bags and gradually disposes of them in various locations throughout the city. She begins to have frequent nightmares and hallucinations of the first assailant stalking her, and her mental stability begins to dim. Thana is noticed by a man while she is disposing of one of the bagged body parts; retrieving the bag, he chases and frightens her. Fearing another sexual assault, she fatally shoots him. This event furthers her impulse for vengeance. Gradually, Thana transforms her appearance to bee a more and more seductive bait, and sets out to kill any man who annoys her. Near the end of the film, she dons a nun's habit and red lipstick to attend a Halloween party with her boss and co-workers. Her boss tries to take advantage of her and is killed; Thana then begins a shooting spree and targets all the men present. Finally she is stabbed by a female colleague.