Finally a young adult fantasy that is not trapped in the traditional trappings of Greek mythos or mired in Dungeons and Dragons lore. A wonderful blend of reality and fantasy. If you would like to read something fresh and different try The Marble Game by Sara Sloane. It's a first book from a writer with great promise and story that is not going to go lockstep down the usual roads.
If your not sure look at the short stories on her site to get a feel for the world.