Leonardo DiCaprio, Matt Damon, Jack Nicholson and Mark Wahlberg star in Martin Scorsese's new crime drama "The Departed." "The Departed" is set in South Boston where the sta..

Rookie cop Billy Costigan (Leonardo DiCaprio) grew up in crime. That makes him the perfect mole, the man on the inside of the mob run by boss Frank Costello (Jack Nicholson)..