The Invention of Hugo Cabret is a book about a twelve year old boy named Hugo who lives in the walls of a Paris train station. When Hugo's life gets turned upside down he sets out to find answers. A stolen key, a mechanical man, an old man, and a hidden message from his dead father all have one thing in common in this grasping mystery.
Brian Selznick has also written a book called Wonderstruck.
Yes, for people who love "on the edge of your seat mysteries", this would be a great book to read.