Fight-like noises emanate from a Hong Kong building. After a shot is fired, the neighbors begin to suspect that they have just overheard a murder, and the police receive numerous distress calls. A rookie cop named Law Yau Tai is assigned to the case, and he poses as a salesman in order to investigate the suspect, a woman named Lui. However, during the course of his investigation, he finds himself falling in love with the woman. Things become even more complicated when the murder victims decide that they have something to say as well!