I wasn't familiar with the meaning of the film at the begining. Not until I looked it up in the dictionary. Not only the film's name was self-explanatory, but it also has, in a way or another, a poetic meaning. This is one of the meanings I found in internet:
(in folklore) an ugly, stupid, or strange child left by fairies in place of a pretty, charming child.In a tragedy way, a 1920's single mother who works as a telephone operator in Calefornia, struggles in looking for her kidnapped son. To avoid losing face, the police gave her a boy claiming that he is her son. Although she assured and insisted that he was not her son, they convinced her to keep him for a while. She decided to give it a try after the pressure the police put on her. Not until she lost her patience, especially that it turned out that her son was not the first one to be kidnaped and never came back.
The case grabbed the community's attention, everyone in Calefornia was annoyed and disappointed of the police. She didn't stop searching. She didn't lose hope. She insisted, and continued, until her individual case solved an entire society problem.
There are so many lessons we can learn from this film, this is why I recommend it.