At 25, Joanne Rowling had the idea that would change her life from a destitute and depressed single mother to the world’s first billionaire author.
"I was on the train from Manchester to London, and it came. It just came," Rowling previously said of her inspiration for the popular "wizarding world" series.
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Natalie Morales hosts as we find out what inspired the books and their secrets.
J.K. Rowling Behind Closed Doors airs Wednesday at 9ET/8PT on Reelz.