In this crime drama (based on Hong Kong movie Internal Affairs) Boston cop Colin Sullivan (Matt Damon) wants to take out Irish mob boss Frank Costello (Jack Nicholson). Billy Costigan (Leonardo DiCaprio) is a former cop who has been taken under Costello’s wing. But both Billy and Colin are moles working for the other side, and a solid thriller emerges as pieces are bumped off the chess board at an increasing pace.

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