JK Rowling has revealed that she's created a new film based in the magic world of Harry Potter.
The movie will be called Fantastic Beasts And Where To Find Them and is inspired by a textbook of the same name taught at Hogwarts.
But Harry Potter will not appear, as the film takes a look at the back story for the author of the textbook.
Newt Scamander - the magical creatures tutor - was one of JK's favourite characters and this tale will tell his story.
It will start 70 years before Potter's story and will be based in New York.
Warner Bros had originally approached the author with the idea, requesting the rights for the film.
She told them she loved the idea but could not trust another writer with creating the screenplay.
The 48-year-old announced on her Facebook page: "Having lived for so long in my fictional universe, I feel very protective of it. I already knew a lot about Newt.
"As hardcore Harry Potter fans will know, I liked him so much that I even married his grandson, Rolf, to one of my favourite characters from the Harry Potter series, Luna Lovegood."
She went on: "Although it will be set in the worldwide community of witches and wizards where I was so happy for 17 years, Fantastic Beasts And Where To Find Them is neither a prequel nor a sequel to the Harry Potter series, but an extension of the wizarding world.
"The laws and customs of the hidden magical society will be familiar to anyone who has read the Harry Potter books or seen the films."
JK has had two non-fantasy novels published since Harry Potter - The Casual Vacancy and The Cuckoo's Calling - and has repeatedly said that she will not write anymore Harry Potter books.
But she never made any promises about a screenplay...
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