The Foundling by Paul Joseph Fronczak is an incredible true story.

In 1964 a newborn was stolen from a Chicago hospital.

Two years after the kidnapping a toddler turns up in Newark, New Jersey and everone decides that child is the missing Chicago baby, Paul Fronczak.

But it's not Paul, and much of Paul’s book is about the investigation he undertakes to find out who his biological parents are.

https://www.foundlingpaul.com/