graculus

Castle in the Air (the book, *not* the film) is a sort of sequel, in that it's set in the same universe, and some of the same people show up, but she almost never does direct sequels (there is one I can think of off hand. ) The book was a disappointment to me, but her Charmed Life, and Power of Three are to this day two of my favorite books. I think I actually own all of them except Wilkin's Tooth and The Ogre Downstairs. they aren't all fantastic, but they are almost all good. IMO *g*

I can't believe you've never come across her before. I've read her books all my life.