Gary does his usual routine to help others, and finds himself involved with the robbery of an ancient Chinese helmet that was stolen from LA. Detective Sammo Law from the Los Angeles police department is in Chicago looking for the missing helmet. After investigating Gary's involvement with the case, Sammo and Gary find out Gary accidentally bought the helmet as a piece of an art decoration object. Unfortunately the helmet is stolen again, forcing Sammo and Gary to team up to get it back, while trying to stop the man who stole it and his niece from being murdered by international smugglers who want the helmet.

Gary parvient à sauver un homme nommé Han mais l'agresseur se retourne contre lui. Sammo, détective de Los Angeles, arrive à temps pour le tirer d'affaire. Encore interloqué par l'intervention de Sammo, Gary intervient lors d'un hold-up pour protéger une artiste du nom de Amy Hunter. Il se renseigne pour acheter l'une de ses sculptures quand tout à coup les agresseurs de Han reviennent. Gary les empêche alors de saccager le studio de l'artiste...