Jet Li plays Kung Wei, an undercover cop from Beijing who is sent to Hong Kong to infiltrate the ring of a notorious crime boss. While Kung is away, his ailing wife dies. Kung’s precocious son asks the Hong Kong police officer investigating his father to take him to Hong Kong to find him. As the mob leader and his henchmen plan an elaborate heist, Kung Wei struggles not to reveal his identity even when his son is captured by the crime boss.