A spelling error on an early copy of Harry Potter And The Philosopher's Stone has proved to be worth its weight in gold.
The book is a proof copy, published before the first official versions of the Potter novels came out. It says it's by JA, not JK, Rowling.
But that's just added to its value: it was sold at auction for a whopping £1,468 on Monday.
About 100 proof copies of the novel were printed for book industry people.