An undercover cop infiltrates a gang of thieves who plan to rob a jewelry store.

Ko Chow is about to resign from the police force when he is asked to take on one more case. He is to go undercover in a gang that is robbing jewellery stores. He accepts the task and successfully infiltrates the gang. It is a very dangerous mission, not just because the gang might discover his true identity but because many of the police suspect he may well be a criminal.—grantss