Rise of the Serpents: Book Two of the Walker Chronicles

Having disappeared over a thousand years ago, dragons have returned to the Kingdom of Regdon with a vengeance. Desperate to stop them, King Ehlos has come up with a plan, but a stubborn wizard named Porodon refuses to do his part. Young Torin has problems of his own. Having turned from Gharan-Dis after the death of his love, the former monk sets out with Aisha to help their friend Gaius Blackhollow find his dead father's home and the secrets within. Along the way, Torin and his friends will seek clues about the dragons' ultimate goal. But Torin soon learns a dark truth about Gaius, and he must unravel the mystery or face losing his friend.