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.
A CIA operation to purchase classified Russian documents is blown by a rival agent, who then shows up in the sleepy seaside village where Bourne and Marie have been living. The pair run for their lives and Bourne, who promised retaliation should anyone from his former life attempt contact, is forced to once again take up his life as a trained assassin to survive.
Bourne is brought out of hiding once again by reporter Simon Ross who is trying to unveil Operation Blackbriar, an upgrade to Project Treadstone, in a series of newspaper columns. Information from the reporter stirs a new set of memories, and Bourne must finally uncover his dark past while dodging The Company's best efforts to eradicate him.
Wrongfully convicted of murdering his wife and sentenced to death, Richard Kimble escapes from the law in an attempt to find the real killer and clear his name.