The first Two Lives of Lukas-Kasha is a fabulous book. I has some real interesting perpectives on how people look at the world and themselves. Worth the read. 12+ and above would get more out of the book as it is more philosophical than most Youth Fantasy. Google Image Result for http://upload.wikimedia.org/wikipedia/en/c/c5/Lk_alexander.jpg
Hugo is an orphan, clock-keeper and thief living in the walls of a Paris train station.