separated at reel birth: the departed affairs

Martin Scorsese's The Departed versus Andrew Lau's Infernal Affairs."Undercover cop Billy Costigan (Leonardo DiCaprio) is assigned to bust the syndicate run by mob boss Costello (Jack Nicholson). Colin Sullivan (Matt Damon) is a criminal who has infiltrated the police department as an informer. When the two are in danger of being exposed, each must race to uncover the identity of the other man