After her fiancé, Takahashi (Tôru Nakamura), fails to appear at a Las Vegas wedding chapel, disgrunted bride-to-be Macy (Kelly Chan) flies to Tokyo to confront him. When she discovers the yakuza shares her curiosity about Takahashi's whereabouts, Macy hires brilliant Chinese private investigator Lam (Tony Leung Chiu Wai) and the search begins. But when Lam catches himself falling for his beautiful client, he realizes that finding his man may present even more difficulties than he first imagined.