The Departed (2006) Characters, Setting & Themes Explained

The Departed is set in South Boston, a gritty neighborhood in Boston, Massachusetts. The city itself becomes almost a character in the film, with its rich history of organized crime and institutional corruption providing the backdrop for the tense confrontation between law enforcement and the mob.

• boston
• south boston
• setting
• location
• crime city

Boston's Irish-American community is central to the film's criminal underworld. The Irish mafia, led by Frank Costello, operates as a powerful organized crime force with deep roots in the city's neighborhoods. This cultural context shapes the dynamics between the mob, the police, and the city's ethnic identity.

• irish mafia
• irish american
• boston crime
• organized crime
• costello

The Departed is set in contemporary times, though it references past violent events in Boston's history. This modern setting allows the film to explore how organized crime has evolved and persisted across generations in the city, blending historical tension with present-day corruption.

• time period
• era
• contemporary
• modern
• boston history

Frank Costello is the ruthless Irish-American mob boss at the center of the film's criminal world. Portrayed as manipulative and cunning, he maintains power through intimidation, violence, and a distorted sense of racial superiority. He essentially raised Colin Sullivan, the cop who secretly works for him, creating a twisted mentorship that drives much of the film's conflict.

• frank costello
• jack nicholson
• mob boss
• irish mob
• crime lord

Colin Sullivan is a young, ambitious Boston police officer who rises through the ranks while secretly working as a mole for Frank Costello's criminal organization. Raised under Costello's influence, he embodies the film's theme of corruption within law enforcement, navigating his dual identity as both a cop and a criminal informant.

• colin sullivan
• police officer
• mole
• costello
• corruption

Billy Costigan is an undercover state police officer assigned to infiltrate Frank Costello's crime organization. Born into a family with criminal ties, he represents the moral struggle between his duty as a cop and his troubled background. His mission to bring down Costello from within forms the core of the film's tension and tragic arc.

• billy costigan
• undercover cop
• leo dicaprio
• infiltration
• costello

Betrayal is the central theme of The Departed, permeating every relationship in the film. Both Colin Sullivan and Billy Costigan live double lives, betraying either the police or the mob. The film explores how betrayal destroys trust between people, leading to the tragic consequences that define the story's bleak ending.

• betrayal
• loyalty
• deception
• double life
• trust

The Departed deeply explores the struggle of identity through its two protagonists living double lives. Both Billy Costigan and Colin Sullivan operate undercover, blurring the lines between their public personas and true selves. The film examines the psychological toll of maintaining these competing identities and questions whether the mask ever truly comes off.

• identity
• double life
• undercover
• masks
• self discovery

Power dynamics drive every major relationship in The Departed. Frank Costello maintains control through fear and manipulation, while both the police and mob hierarchy are portrayed as corrupt. The film illustrates how the pursuit of power erodes morality and corrupts individuals, whether they operate in the criminal underworld or within law enforcement institutions.

• power
• corruption
• control
• costello
• mob police

The final shot of a rat scurrying across the screen serves as a grim symbol of the film's pervasive betrayal and corruption. It suggests that the city of Boston, despite the massive body count, remains infested with informants and deceivers. The cynical final image reinforces the film's bleak view that betrayal ultimately wins, with loyalty meaning nothing in a world of constant deception.

Foreshadowing: Earlier scenes establish that both Sullivan and Costigan operate as informants, setting up the rat's significance as a symbol of betrayal.

• rat ending
• final scene
• symbolism
• corruption
• conclusion