Kit Yun (Jet Li), an undercover Hong Kong police officer who is assigned as a bodyguard to Boss Chiang, a friend of Kit's father. A year into Kit's undercover assignment, Boss Chiang decides to leave the life of organized crime, but not without getting outraged protests by Kwan, one of his associates, only to have various gang members attempt the assassination of Boss Chiang. Despite Kit's efforts, Boss Chiang gets assassinated by a mysterious sniper. During Chiang's dying moments, he tells Kit to deliver an envelope containing information about the crime syndicate to his estranged daughter, Michelle. Being a childhood friend of Michelle's, Kit obliges and heads for San Francisco to deliver the message to her, despite whatever obstacles come in his way.
—Asan