She couldn't stay in Hogwarts forever. According to The Wall Street Journal, Harry Potter creator J.K. Rowling will release her first adult novel ever, titled The Casual Vacancy, on September 27. Her publisher, Little Brown, has released this synopsis of the book:
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This is obviously a departure from Rowling's multi-billion dollar fantasy franchise, but you had to expect that she would stray as far from her bread and butter as possible for this project. After years spent living in the world of Harry Potter and writing stories aimed at kids and teens, it will be interesting to see how her style translates to this new direction.
[The Wall Street Journal via Collider]