Gone Baby Gone (2007)

In the working-class neighborhood of Dorchester, Boston, Patrick Kenzie and Angie Gennaro, private detectives specializing in missing persons, are drawn into the high-stakes case of abducted four-year-old Amanda McCready. Hired by Amanda's relatives, they navigate the complexities of a troubled family and a morally challenging investigation. As they peel back the layers of Amanda's disappearance, the detectives confront ethical dilemmas that test the boundaries of justice in their quest for the truth.