A girl who has been abused by her stepfather moves in with her sister. But there she is further abused by her sister's boyfriend. In the end, she has prepares an act of revenge on the men who used her.

Bumbling private detective Chan Tam is enlisted by police pal Fung Chak to help in the investigation of a serial murder case. The victims a middle-aged man killed at home, a dead woman found in the trash dump, and a teenage girl slain in the park were all killed in grisly manners, but they didn't seem related to one another. With no clue to follow up on, Tam is decidedly at his wits' end.