It is 1920′s Los Angeles and single mother Christine Collins is trying to raise her boy. One Sat she is called in to work and when she returns home little Walter Collins is nowhere to be found. The police set about looking and eventually, after 5 months they bring him back. Only the boy they return to Christine is different; she is, however, informed that those changes are the result of her shock and the boys trauma. Why it is quite the done thing for a boy to shrink 4 inches as a result of such a horrifying encounter. And circumcised now you say? Well it is healthy, and who knows what that drifter may have been thinking. Ms. Collins is not about to rest however. She wants her boy back.