Leaving his young son (Miu Tse) behind in China, a secret agent (Jet Li) slips undercover to pose as a member of a notorious gang in Hong Kong and bring down an infamous crime lord. But his mission is compromised when a female inspector (Anita Mui) unmasks his true identity. The plot thickens when the agent gets word that his son is in serious danger, prompting him to pull double duty as a father and a formidable foe.