Faerie Wars, by Herbie Brennan

Henry is just your normal kid, minding his own business. He cleans Mr.Fogarty's house for some extra money, but soon something miraculous happens. He finds a fairy, and a real one at that. Turns out, the fairy is from another realm, one where war is imminent. We also here the story of Pyrgus, a normal kid from this other realm. Except of course for the fact that he's the Crown Prince. Things can only get interesting from there, and it makes for a great book. I recommend this book to all teens.