Billy Costigan (Leonardo DiCaprio), a promising but volatile young cadet with family ties to Costello, is recruited by
the upstanding Captain Queenan (Martin Sheen) for a years - long undercover mission: he'll be convicted of felony assault and expelled from the force, and after serving a prison term he'll work his way into Costello's gang.
Glen Powell makes the strongest impression as mustachioed gabber Finnegan, Wyatt Russell loosely fills Rory Cochrane's part in Dazed and Confused as the joint - rolling and philosophizing Willoughby, and Tyler Hoechlin makes for an archetypal team
captain as McReynolds, a swaggering hunk by turns
upstanding and infantile.