Gone Baby Gone (2008)

Dorchester, one of the toughest neighbourhoods in all of Boston, is no place for the weak or innocent. It's a territory defined by hard heads and even harder luck, its streets littered with broken families, hearts, dreams. When one of its own, a four-year-old girl, goes missing, private investigators Patrick Kenzie and Angela Gennaro don't want the case. But after pleas from the child's aunt, they open an investigation that will ultimately risk everything - their relationship, their sanity, and even their lives - to find a little girl-lost. Based on the novel by Dennis Lehane.

Official website: http://www.gonebabygone-themovie.com/