The Departed

Starring Leonardo DiCaprio, Matt Damon, Alec Baldwin, Jack Nicholson, Mark Wahlberg and Martin Sheen, The Departed is the story of two moles, in the good guy's and the bad guy's groups.
Nicholson is a well known thug and Damon joins him as a little boy. Nicholson manages to convince Damon to becoming a cop and thereby instilling his mole in the state police.
On the other hand, DiCaprio, with a disturbed family history wants to become a real cop, but because of his history, Wahlberg and Sheen aren't too keen on letting him join but offer him the position of the mole with the big thug mobster. Without much option, DiCaprio agrees.
Over the course of the movie, it is cat and mouse game with the thugs and police, with the mobs getting away everytime. Finally, in a ironical twist, Damon is appointed to investigate the mole. To get rid of Sheen and to clear the way for Nicholson, Damon follows Sheen and Sheen ends up dying, with the news reaching the mobsters too.
After this, it is just a crazy mess up of all the facts and in an earnest effort to be himself again, DiCaprio tries to get away, but realizes Damon was the mole all along. DiCaprio dies in proving himself. But finally justice is delivered by Wahlberg.
A very interesting movie. Definitely worth the watch. DiCaprio has performed great as the very stressed mole and Wahlberg has done well in being the foul mouthed cop, making cringe sometimes, when he swore away as well. Although it did make me wonder what sort of cop would keep such as employee as his right hand.