Changeling (2008)

In 1928 Los Angeles, single mother Christine Collins (Angelina Jolie) faces a harrowing ordeal when her son Walter disappears. The L.A.P.D. finds a boy resembling Walter, but Christine insists he's not her son. As she speaks out against the police, she becomes a target of intimidation. Simultaneously, an officer investigates a chilling tale, unfolding a gripping narrative of murder, abuse of power, and the quest for justice.