this a superbly act film about an undercover cop ( sean pen ) who infultrates a group of american or irish gangster who he use to be friend with . the storyline be not the best but it do not have to be when you be watch people like gary oldman act his sock off . the film be shot superbly too and especially the fantastic gun fight at the very end in the irish bar . if there be one critisism i have to make of this film it would be that it be a little too long which can make it feel a little slow . overall and if you like gangster movie you will like this . positive .