The Departed Story

The Departed film begins in South Boston and Charlestown, where Irish mob boss Francis "Frank" Costello (Nicholson) beguiles a young neighborhood boy named Colin Sullivan (Conor Donovan), who enters into Costello's criminal underground at a young age. Years later, Colin (now played by Damon) completes his training for the Massachusetts State Police, graduating as a state trooper.

Colin, who quickly distinguishes himself, is assigned to the Special Investigations Unit ("SIU") of the State Police by SIU's Captain Oliver Queenan (Sheen) and Staff Sergeant Sean Dignam (Wahlberg). However, Colin's express intent is to serve as a double agent for Costello within the police force.
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