Bad Luck: The Bad Books, Book 2 (paperback) Pseudonymous Bosch
Some people have all the luck.
Unfortunately, Clay isn't one of them: He's the only camper at Earth Ranch without a magical talent. As if feeling totally useless isn't enough, Clay has to figure out what to do about Brett, a castaway boy who has just washed ashore and is determined to keep his presence a secret. Even as Clay helps his new friend hide in the remote volcanic island's wilderness, another fiery mystery begins to emerge, with all signs pointing to the impossible idea that dragons once roamed the island...and may still. Can Clay and his friends turn their luck around in time to uncover Price Island's secrets--and save it from a scorching end?