In Boston, a merciless battle rages between the police and the Irish mob. To put an end to the reign of godfather Frank Costello, the police infiltrate his gang with a "rookie" from the slums, Billy Costigan.
As Billy struggles to gain the aging thug's trust, Colin Sullivan joins the police force's Special Investigations Unit, tasked with eliminating Costello.
But Colin is operating as a "submarine" and informs Costello of the operations being plotted against him. Risking exposure at any moment, Billy and Colin are forced to lead double lives that cause them to lose their bearings and their identities.
Traps and counter-offensives follow one another until the day each side realizes it is harboring a mole. A race against time begins between the two men with a single objective: to discover the other's identity or risk losing their lives...
The Departed movie trailer
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