The War for the Four Worlds: Book Five of The Gealstone Saga

Prince Adlin now leads the armies of Palatia in the wars started by his usurping uncle, but a new Gealstone has appeared from the world within the Well, wielded by Adlin's own double, the dangerous king who threatens to remake Palatia in the ruined image of his own domain. Princess Adelina, with the Eolian chief Ennon, has been banished to the Fourth World-the land of the dead-and there faces the Brotherhood, the secret society of magicians who seek the Lifesource, a font of potentially fatal power. But the forces already unleashed have set in motion a cataclysm that will destroy all of the worlds. Can Adlin and Adelina fight from opposite ends of the universe to save it?