Harry Potter by JK Rowling (just in case they're the only kids on the planet who haven't read it...)
Sabriel by Garth Nix (there are 3 more books and a short story in that world if they like it)
The Wolves of Willoughby Chase by Joan Aiken (lots more in this series if they like that book)
Over Sea, Under Stone by Susan Cooper (first in a five part series)
Coraline by Neil Gaiman
Howl's Moving Castle by Diana Wynne Jones (very different from the movie, but also great)
Ronia The Robber's Daughter by Astrid Lindgren
The Hounds of the Morrigan by Pat O'Shea
Truckers by Terry Pratchett and Only You Can Save Mankind by Terry Pratchett (each the first part in a trilogy) Nation by Terry Pratchett (a standalone novel)
Uh... those are off the top of my head :-D
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