Beginning withInto the Darkness, Darkness Descending, andThrough the Darkness, bestselling author Harry Turtledove ("The master of alternative history"-Publishers Weekly) has been telling an epic tale: the story of a world war, comparable to the terrible world wars of our own 20th century, in a world where magic works. Imagine the drama and terror of the Second World War-only the bullets are beams of magical fire, the tanks are great lumbering beasts, and fighters and bombers are dragons raining fire upon their targets. Welcome to the world of the Derlavaian War, a world that is slowly but surely being conquered, mile by bloody mile, by the forces of the Algarvian empire . . . forces whose most terrible battle magics are powered by the slaughter of innocent people, the Kaunians, whom Algarve-like much of the world-holds in disdain. InRulers of the Darkness, the fourth volume of the series which began withInto the Darkness, the war for the continent of Derlavai builds toward its crescendo as the mages of Kuusamo, aided by their former rivals from Lagoas, work desperately to create a newer form of magic that will change the course of the war. But this is really a story of ordinary people-on all sides of the conflict-forced by fate to rise to their heroic limits . . . or sink to the level of their darker natures.