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: 

When Barry Fairweather dies unexpectedly in his early forties, the little town of Pagford is left in shock.

Pagford is, seemingly, an English idyll, with a cobbled market square and an ancient abbey, but what lies behind the pretty façade is a town at war.

Rich at war with poor, teenagers at war with their parents, wives at war with their husbands, teachers at war with their pupils…Pagford is not what it first seems.

And the empty seat left by Barry on the parish council soon becomes the catalyst for the biggest war the town has yet seen. Who will triumph in an election fraught with passion, duplicity and unexpected revelations?

Blackly comic, thought-provoking and constantly surprising, The Casual Vacancy is J.K. Rowling’s first novel for adults.

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