Chris Faraday once smuggled illegal items or contraband into the country on freighters. He left that life behind, got married has a family and went legit. But when his brother-in-law got involved with Briggs, a drug dealer and when he blew a deal, Briggs demands restitution which he can't deliver. So Chris offers to find a way to pay him but the he threatens Chris' family if he doesn't deliver. So he gets on a freighter destined for Panama and he sets out to bring back some counterfeit currency. Briggs "goes to see" Chris' family. When Chris learns of this he asks his friend Sebastian to take care of them which he does. He tells Chris that it would be better to bring drugs instead of the cash.

Childhood friends Jimmy Markum, Sean Devine and Dave Boyle reunite following the death of Jimmy's oldest daughter, Katie. Sean's a police detective on the case, gathering difficult and disturbing evidence; he's also tasked with handling Jimmy's rage and need for retribution.

In South Boston, the state police force is waging war on Irish-American organized crime. Young undercover cop Billy Costigan is assigned to infiltrate the mob syndicate run by gangland chief Frank Costello. While Billy quickly gains Costello's confidence, Colin Sullivan, a hardened young criminal who has infiltrated the state police as an informer for the syndicate, is rising to a position of power in the Special Investigation Unit. Each man becomes deeply consumed by his double life, gathering information about the plans and counter-plans of the operations he has penetrated. But when it becomes clear to both the mob and the police that there's a mole in their midst, Billy and Colin are suddenly in danger of being caught and exposed to the enemy-and each must race to uncover the identity of the other man in time to save himself. But is either willing to turn on the friends and comrades they've made during their long stints undercover?