Martin Scorsese returns to his gangster roots, and directs a Boston / Irish flavoured remake of the Hong Kong classic Infernal Affairs.
Leonardo Di Caprio is a cop infiltrating the mob. Matt Damon (a Boston native) is a mob man infiltrating the cops. Martin Sheen, Alec Baldwin & Marky Mark Wahlberg are actual cops. Vera Farmiga is the love interest. And best of all, Jack Nicholson steals the show with a ferociousness not seen since The Shining, as sex-addicted mob boss Frank Costello.
The story focuses on the war between mob and police, the growing paranoia of their respective bosses about having a mole in their ranks, and the like-wise paranoia suffered by Di Caprio & Damon for being found out.