“The Departed (2006)” revolves around two main characters, Billy Costigan (played by Leonardo DiCaprio) and Colin Sullivan (played by Matt Damon). Billy is a young police officer infiltrating the criminal gang of mob boss Frank Costello (played by Jack Nicholson). Meanwhile, Colin is a special unit officer placed as a mole within the police force for Costello. Both characters become embroiled in a fierce battle and power struggle between crime factions and law enforcement in Boston.

The conflict between Billy and Colin unfolds amidst schemes, tactics, and shocking revelations as they strive to topple their adversaries both within and outside the police force. Their confrontation gradually reveals more complex secrets and plots than they could have imagined.