Billy Costigan is a young police officer with a troubled family history. To prove himself, he is recruited by Captain Queenan and Sergeant Dignam to go deep undercover. His mission is to infiltrate the inner circle of Frank Costello, a ruthless and powerful Irish Mob boss. Billy must endure the mental toll of living as a criminal while constantly fearing exposure.

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A protégé of Costello who has successfully infiltrated the Massachusetts State Police, serving as a high-level mole for the criminal underworld.