Starcross by Philip Reeve & David Wyatt (kid's book)

This book is terrific! It is so funny and entertaining. It sort of reminds me of a cross between the magical air of The Invention of Hugo Cabret and the quirky strangeness of a Jasper Fforde novel. It's the second in a series (which I didn't know when I picked it up), and now I've got the first one on my list to read as well.