Movie Summary:

Two just-graduated officers from Massachusetts State Police Academy follow opposite sides of the law: William Costigan is assigned to work undercover with the Irish mobster Frank Costello to get evidences to arrest him. His true identity is only known by his superiors Dignam and Oliver Queenan. The protégée of Costello, Colin Sullivan, is promoted in the Massachusetts State Police and is the informer of Costello. Each police officer gives his best effort trying to disclose the identity of the other "rat".

Billy Costigan, a young man from a crook family, wants to do redeem the Costigan family by joining the cops. However, the cops see him as the perfect mole because of his crook family, so they send him undercover to the Irish Mob. Meanwhile, Frank Costello, the mob boss, sends in Colin Sullivan to become a cop for the opposite purpose. Both get caught up in their double lives and become obsessed with finding the other mole, as does Costello and Queenan, the heads of each side.

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