Synopsis
An undercover cop and a mole in the police attempt to identify each other while infiltrating an Irish gang in South Boston.
The Departed
📅 Oct 06, 2006 ⏱ 2h 31m 🌐 ENGLISH 🎬 Dir: Martin Scorsese
Why it is worth knowing
The Departed is a 2006 Boston crime thriller directed by Martin Scorsese and written by William Monahan, adapted from the Hong Kong film Infernal Affairs. Leonardo DiCaprio plays Billy Costigan, a police officer sent undercover into Frank Costello's organisation. Matt Damon plays Colin Sullivan, who joins the police while secretly reporting to Costello. Jack Nicholson, Vera Farmiga, Mark Wahlberg, Martin Sheen, Alec Baldwin and Ray Winstone surround two men living inside institutions that would destroy them if their identities became known. The film is violent and darkly funny, using parallel lives to examine loyalty, class, family influence and the psychological cost of deception.
Themes and ideas
What The Departed explores
Identity becomes a job performed without a safe private self. Billy must appear criminal while hoping his police handlers still recognise him, and Colin performs public success while protecting the system that created him. Both men depend on institutions that use secrecy and incomplete records. Father figures offer belonging with conditions: Costello recruits and corrupts, while Queenan tries to protect Billy but still sends him into danger. The story also asks whether status can erase origin. Colin gains an apartment, career and relationship, yet fear turns each achievement into another place where he may be exposed. Loyalty without moral judgement becomes a tool for control.
Cast and crew
Directing
Martin Scorsese — Director
Writing
William Monahan — Writer · Alan Mak — Writer · Felix Chong — Writer
In-depth guide
A mole inside each side
Frank Costello takes an interest in young Colin Sullivan and later places him inside Massachusetts law enforcement. Colin rises quickly and gains access to investigations targeting Costello. Billy Costigan comes from a family background useful for undercover work and is asked by Captain Queenan and Sergeant Dignam to enter Costello's group after a false appearance of dismissal and prison time. Neither the wider police team nor the criminals know Billy's true role. When a transaction reveals that information is leaking from both organisations, Costello and the police begin searching for their respective informants. Colin is effectively assigned to find himself, while Billy tries to identify a police mole without exposing the only handlers who can confirm his service. Psychiatrist Madolyn becomes connected to both men's divided lives without initially knowing the full relationship. The plot moves quickly through calls, coded messages and surveillance; viewers should track who has access to which phone and which identity rather than memorising every unit title.
Verified Jul 16, 2026
DiCaprio's pressure against Damon's control
Leonardo DiCaprio makes Billy physically tense, sleep-deprived and increasingly desperate for official recognition. He can perform aggression inside Costello's group, but private meetings reveal how close the role is to consuming him. Matt Damon gives Colin relaxed institutional confidence and a rapid ability to redirect suspicion. His polished life looks stable until small pieces of information threaten exposure. Jack Nicholson makes Costello theatrical, funny and cruel, using unpredictability to keep followers uncertain about whether a conversation is a test. Vera Farmiga gives Madolyn professional intelligence and personal frustration, though the plot uses her relationship with both men partly to connect their hidden selves. Martin Sheen brings quiet care to Queenan, while Mark Wahlberg's Dignam uses hostility as both personality and protective method. Alec Baldwin provides energetic organisational pressure. The ensemble makes every room a contest over who can appear least afraid.
Verified Jul 16, 2026
Phones, reflections and an unstable Boston
Scorsese and cinematographer Michael Ballhaus use Boston locations, glass, mirrors and divided frames to reinforce lives that are never fully private. Mobile phones are central props: information can cross institutions instantly, but a vibration, wrong number or delayed answer can reveal the person carrying it. Thelma Schoonmaker's editing moves between Billy and Colin so their actions echo without making them identical. Quick transitions keep police procedure understandable while creating the feeling that exposure can arrive from any direction. Howard Shore's score and songs including the recurring Rolling Stones recording give Costello's world swagger, while Dropkick Murphys connect the film with an aggressive local identity. Violence is sudden and often refuses a long emotional preparation, matching a story where careful plans can end through one opening door. The final visual symbol is deliberately blunt, a dark joke after a narrative filled with hidden signs and indirect speech.
Verified Jul 16, 2026
Institutions that need deception and cannot contain it
Both police and criminal organisations rely on secret information, but secrecy weakens their ability to know who belongs. Billy sacrifices his public identity for the police, then discovers that poor records and dead handlers could erase the meaning of that sacrifice. Colin uses police trust to protect Costello but also wants the respect and ordinary future his position provides. He cannot separate those goals because the foundation remains hidden crime. Costello calls loyalty a family relationship while using followers as assets and maintaining his own arrangements. Queenan is more humane, yet he still asks Billy to endure a role causing serious psychological damage. The film's Catholic and family imagery adds questions of guilt, inheritance and confession without offering easy forgiveness. Adaptation from Infernal Affairs moves the conflict into Boston's specific class and ethnic environment. Comparing the two films shows how one structure can support different cultural emphases rather than one simply replacing the other.
Verified Jul 16, 2026
Adult crime content and adaptation order
The Departed is intended for adults. It contains frequent strong language, racist and homophobic slurs, shootings, blood, beatings, sexual material, drug references, betrayal and sudden deaths. The tone includes dark comedy but does not reduce the intensity. It is not appropriate for children and may be unsuitable for younger teenagers under local classifications. The film stands alone; viewers do not need to watch Infernal Affairs first, although seeing the Hong Kong original later provides valuable comparison. Those sensitive to stories in which undercover stress and institutional failure receive little relief should approach carefully. The plot rewards attention, but no specialist police knowledge is required. Names and phone relationships matter more than procedural terminology. Modern viewers can also distinguish the film's fictional Costello from Boston criminal histories that partly influenced the character. For factual study, use reporting and court history rather than treating the screenplay as evidence.
Verified Jul 16, 2026
Frequently asked questions
Is The Departed a remake?
It is an adaptation of the 2002 Hong Kong crime film Infernal Affairs, relocated and substantially reshaped for Boston.
Who are the two informants?
Billy Costigan is a police officer undercover with Costello, while Colin Sullivan is Costello's informant inside law enforcement.
Is The Departed suitable for teenagers?
It has an adult rating in many regions because of strong language, graphic violence, sexual material and sustained criminal themes.
Continue exploring
More ways to explore The Departed
Use connected credits, genres and editorial coverage to move from this title to useful related pages.
Explore the cast
Open performer profiles and follow their connected movie and series credits.
Browse peopleCheck streaming guides
Explore platforms and region-aware availability records.
Browse platformsRead editorial work
Find original entertainment reviews, explainers and streaming articles.
Read articles