JK Rowling is taking part in a night-time book signing to mark the publication of Harry Potter And The Deathly Hallows.
The author will meet Potter fans at the Natural History Museum in London on July 21 with the event beginning at midnight and lasting until dawn.
Fans can apply for free tickets via publisher Bloomsbury's website and a total of 1,700 lucky participants will be chosen, with all getting a free signed copy of the new book.
The first 500 randomly selected winners will also be invited to attend a reading of the book by the author.