The Lost City of Sorianne — John O'Riley

With Josephine's son and the entire city of Briodanis in peril from an unknown and powerful enemy, Josephine embarks on her greatest adventure yet when she follows a trail of clues that hint that the city of Sorianne may not have been destroyed after all. If the inhabitants of this ancient city are still alive, there may be White Knight elders among the survivors and the only ones who wield strong enough white magic to save her son and the world.