Gone Baby Gone

When 4 year old Amanda McCready disappears from her home and the police make little headway in solving the case, the girl's aunt Beatrice McCready hires two private detectives Patrick Kenzie and Angie Gennaro. The detective freely admit that they have little experience with this type of case, but the family wants them for two reasons - they're not cops and they know the tough neighborhood in which they all live. As the case progresses, Kenzie and Gennaro face drug dealers, gangs and pedophiles. When they finally solve the case, they are faced with a moral dilemma that tears them apart.

Gone Baby Gone is a 2007 American crime drama/mystery film directed by Ben Affleck and starring Casey Affleck. The screenplay by Ben Affleck and Aaron Stockard is based on true events and the novel of the same name by Dennis Lehane, author of Mystic River. The plot centers on two private investigators, Patrick Kenzie and Angela Gennaro, hunting for an abducted four-year-old girl from the Boston neighborhood of Dorchester.

Source: Wikipedia