What happens when you learn your family is not your own?

In 1951, Mary Kaye Miller gave birth to a baby girl. But when she brought the infant home, she suspected something was wrong. 43 years later, she broke the news: her baby had been switched at the hospital. And the girl she'd raised actually belonged to a family living just a few towns away.

Deep Cover host Jake Halpern first reported this story for This American Life in 2008. Ira Glass calls it one of the best episodes they've ever done. In it, both families and their daughters grapple with the fallout of this long held secret.