Los Angeles, 1928. A single mother Christine Collins (Angelina Jolie) returns from work to find her nine-year-old son gone. She calls the LAPD who initiate a search. Reverend Gustav Briegleb (John Malkovitch) champions Mrs Collins cause and publicly criticises the LAPD for its endemic corruption and incompetence. Five months later, a boy is found in Illinois who fits the description of the missing boy, Walter. Captain J. J. Jones (Jeffrey Donovan), the head of the LAPD's Juvenile Division, hoping to capitalise on a successful resolution to the case, organises a press conference when reuniting the Mrs Collins with her son. However, Christine quickly denies that the boy is Walter, stating that this child is three inches shorter than her own son. The authorities dismiss her claims and label her hysterical. Matters are further compounded when Mrs Collins joins Reverend Gustav in his public criticism of the police. The establishment subsequently closes ranks and attempts to intimidate and silence her.