Can Gwen, Vic, and their friends succeed—and survive—in the exciting conclusion to the Crystal Doors trilogy? From New York Times bestselling authors Rebecca Moesta and Kevin J. Anderson Will the five friends forge the magical Ring of Might? If they do, will they be enough to challenge Azric? Now their friend Sharif is next in line to the throne of Irrakesh, the sky city. Before he can choose between duty and destiny, Irrakesh is attacked and the flying city is taken hostage by the dark wizard's monstrous winged army. Now Gwen, Vic, and their friends take to the skies for the climactic showdown with the evil wizard and all of his dark forces. Will Gwen and Vic finally vanquish Azric? Or will the unleashed power of the Sky Realm be too much for them?