The Fires of Merlin” is book three in T.A. Barron’s “The Lost Years of Merlin” series, a young adult fantasy novel. In this installment, young Merlin faces a new challenge: a sleeping dragon, Wings of Fire, has awakened and threatens the land of Fincayra. Merlin must find the source of his own magic and face other threats, including the evil kreelixes and the sorceress Urnalda, to stop the dragon’s wrath.