JK Rowling has premiered a collection of fairy tales which she first mentioned in Harry Potter and The Deathly Hallows at a reading in London.
The world famous author has hand-written and illustrated just seven copies of the Tales Of Beedle The Bard.
One will be sold to raise money for her Children's Voice charity at an auction at Sotheby's in London later this week.
Rowling will give away the remaining copies of the stories to those closely connected with the Potter books.
The Tales Of Beedle The Bard played a central role in the seventh book.
A volume was left to the character Hermione Granger by Hogwarts head teacher Albus Dumbledore.
It provided clues to help Harry and his friends in their quest to defeat his nemesis Lord Voldemort.
Rowling has no plans to publish the fairy tales - and Sotheby's expect the auctioned book to sell for up to £50,000.
Each of the seven copies is bound in brown Morocco leather and mounted with different semi-precious stones.
A dedication written in the front of the book says: "Six of these books have been given to those most closely connected to the Harry Potter books during the last 17 years.
"This seventh copy will be auctioned; the proceeds to help institutionalised children who are in desperate need of a voice. So to whoever now owns this book, thank you - and fair fortune be yours!"