The film tells the story of humble London businessman Quan (Chan), whose long-buried past erupts in a revenge-fueled vendetta when the only person left for him to love — his teenage daughter — is taken from him in a senseless act of politically-motivated terrorism. In his relentless search for the identity of the terrorists, Quan is forced into a cat-and-mouse conflict with a British government official (Brosnan), whose own past may hold clues to the identities of the elusive killers.