Roy Chen Chih Lai is a serial rapist and murderer with a leg fetish, and cuts off his victims' legs as trophies after he's through with them. One day at a bank robbery shootout, he catches police woman Cheng Hsuen on camera, and chooses her to be his next victim. He begins to stalk her and enter her personal life, even waiting for her inside her home. He notices her sister, Kelly, as well (who is also a cop), and her boyfriend, Ken. After he kidnaps and rapes Kelly, Cheng decides to lure the madman by using herself as bait, and bring justice to the situation.

Sam Cool and Yat-Tiu are top hitmen for the triads, until Yat-Tiu seduces a mob boss Ma's woman Ling. After his murder Sam Cool and Yat-tiu go on the run, not just from underworld enemies, but from the cops as well, and they are reduced to low-ranking thugs