Cornelia Funke's Inkspell was fantastic! I didn't like the ending very much, but that's because this is only the 2nd book in a trilogy so that wasn't the final conclusion. You should definetly read the 1st book, Inkheart, before reading Inkspell. Otherwise, I think you would kind of be lost and not understand everything as well. But my final statement is:
I loved Inkspell!