Quan is a humble London businessman whose long-buried past erupts in a revenge-fueled vendetta when the only person left for him to love — his teenage daughter — dies in a senseless act of politically motivated terrorism. His relentless search to find the terrorists leads to a cat-and-mouse conflict with a British government official whose own past may hold the clues to the identities of the elusive killers. Ngoc Minh Quan is a retired Vietnam War special forces operator who now runs a Chinese restaurant in London. When his teenage daughter Fan is killed in a department store bombing claimed by a group calling themselves the “Authentic UDI”, a distraught Quan seeks revenge. He first attempts to bribe Scotland Yard officer Richard Bromley for the names of the bombers, but Bromley refuses to accept the bribe nor reveal any information. Quan next focuses on Irish deputy minister Liam Hennessy, who speaks publicly about his status as a former leader of the Unionist forces while condemning the bombing. Keyi Lam, Quan’s co-worker and personal friend, attempts to console and convince him to move on, but he refuses to be swayed and eventually leaves for Belfast to meet Hennessy. Hennessy claims to have no knowledge of the bombing or its perpetrators, but Quan does not believe him. His queries escalate until he becomes fixated on Hennessy, setting off a homemade bomb in his office and threatening more unless he gets the bombers’ names.