A rare copy of Harry Potter And The Philosopher's Stone conjured up a wizard price when it was sold for nearly £20,000 at auction.
The book was one of the first 500 printed in 1997 and was in an immaculate condition.
Most of the first books went to libraries where they were borrowed so a top condition copy is really rare.
It sold for £19,700 - more than twice what was expected - at London auctioneers Christie's.
A publisher's proof copy of the first Harry Potter book sold for £2,250, with the wrong author's name - JA Rowling - printed on it in error.
And a signed paperback edition of the second book, Harry Potter and the Chamber of Secrets, written on by the author JK Rowling: "To Ella - I know your Mum!!! And she beat me in the quiz but we won't mention that - love from Jo", together with a similarly inscribed first hardback copy also sold for £1,250.
The seventh and last book in the series, Harry Potter And The Deathly Hallows, was released on 21 July to record-breaking sales, and the sixth film, Harry Potter And The Half-Blood Prince is due to come out late next year.