The threat of war has loomed over the spheres of the Seven Circles for more than five decades-and now the enemy has finally advanced,forcing the creatures of this peace-loving world into violent battle. As they confront the evil that has descended upon them, Miradel, the druid priestess who has saved her home twice before, journeys to the center of the world--to discover once and for all why the Seven Circles has been engulfed by this enduring darkness, and what can be done to end it.