A man with a shadowy past becomes obsessed with a female detective and starts stalking her. As she uncovers his murderous spree, which includes her boyfriend and others close to her, she is forced into a deadly showdown with him.

Ko leads a team of Hong Kong assassins that are taken out one by one. Ko manages to flee to the countryside, where he aims to find out who's behind this and to gain the strength to fight back. Helping him is local girl Tong, whilst chasing Ko is the long arm of the law, represented by cop Chung.