Gone Baby Gone is a 2007 American neo-noir mystery film directed by Ben Affleck (in his feature-length directorial debut) and starring his brother Casey Affleck. The screenplay by Ben Affleck and Aaron Stockard is based on the novel of the same name by Dennis Lehane, author of Mystic River and Shutter Island. The plot centers on two private investigators, Patrick Kenzie and Angie Gennaro, hunting for an abducted four-year-old girl from the Boston neighborhood of Dorchester.
source: https://en.wikipedia.org/wiki/Gone_Baby_Gone
