Chan Wing Yan, a young police officer, has been sent undercover as a mole in the local mafia. Lau Kin Ming, a young mafia member, infiltrates the police force. Years later, their older counterparts, Chen Wing Yan and Inspector Lau Kin Ming, respectively, race against time to expose the mole within their midst.
Rogue terrorists steal the revolutionary invention the Seed of God for world domination. After Interpol agent Sir Sampan's underhanded tactics to recruit young billionaire Huo, the team rallies to rescue and retrieve their prized invention.