Harry Potter fans in France have been snapping up English versions of the latest book, as they can't get it in their own language yet.
The Half-Blood Prince won't be on sale in French until October - so loads of people have been reading the English language one instead.
The book came number five in a French best-sellers list, even though it's not in their native language.
Potter six has sold millions of copies around the world since its release.
How some Potter words appear in the French version
English - French
Hogwarts - Poudlard
Hufflepuff - Poufsouffle
Ravenclaw - Serdaigle
Slytherin - Serpentard (snake-like)
Half-blood - Sang-Mêlé (mixed blood)
Muggle - Moldu
Parselmouth - Fourchelang (forked tongue)
Crookshanks - Pattenrond
Severus Snape - Severus Rogue
OWL (Ordinary Wizarding Levels) - BUSE (Brevet Universel de Sorcellerie Elémentaire)
The four books which are above the Half-Blood Prince in the poll are all French language books.
The long-awaited wizard novel sold an incredible two million copies in the UK in its first 24 hours.
And it sold a whopping 6.9 million copies in the United States on its first day alone.
Since its release on 16 July, it's broken publishing records all around the world.