It's not in the shops yet, but the sixth Harry Potter book has been selling by the lorry-load.
100,000 copies of Harry Potter and the Half-Blood Prince have been ordered on internet shop Amazon, topping their book charts since December.
It's a similar story for high street stores. WH Smith say it's doing better than book five did, and Waterstones say their orders are going extremely well.
Fans will have to wait until 16 July for the book to come out.
When it was released, Order of the Phoenix became the fastest-selling book of all time, shifting 1.8 million copies in one day.
Compared to that, Half Blood Prince is catching up fast.
It took just under three-and-a-half months for OOTP to sell 130,000 pre-ordered copies on Amazon, becoming the company's biggest ever seller.
HBP has sold 100,000 on the site in just over one month, so if sales keep on going, it should crack that record pretty soon!
Either way, JK Rowling should have a fairly big smile on her face by 16 July!