Lieutenant Nick Chen (Chow) is head of the Asian Gang Unit of New York City Police Department but also an informant for the Tongs under "uncle" Benny Chan (Chan) and his lieutenant Henry Lee. Danny Wallace is assignated by Internal Affairs to join the AGU to secretly monitor Chen for corruption. But soon, Danny realizes that certain concessions must be made to ensure the peace in this area. He decides to team up with Chen to both the gangsters and the temptation of bribery and corruption which is conquering the police forces.