Gone Baby Gone is a film about the disappearance of a child, and the morally ambiguous secrets and lies that get uncovered during the investigation.
This is definitely one of the best films of the year, and it's also one of the very best examples of the character arc that I've ever seen. The main character, the private investigator Patrick Kenzie (played very well by Casey Affleck), goes through quite an emotional journey where he learns just what kinds of sacrifices come with holding on to one's beliefs, and the viewers are firmly riding shotgun all the way to the bittersweet end. Kudos to Ben Affleck for turning in a fantastic directorial debut, and for co-writing the razor sharp screenplay adaptation of the Dennis Lehane novel. Amy Ryan turns in a star-making performance as the mother of the child, with Ed Harris and Morgan Freeman doing their usual stellar work, and the rest of the cast is excellent as well. Good stuff all around, and very highly recommended.