Once, one hundred moons rose every evening with Mother Night across the Eternal Sky. Once there were one hundred sons and grandsons of the Great Khagan who ruled the Steppes from one edge of the world to the other. Now, the flame of civil war is burning, and Temur's iron moon is one of only a handful remaining in the Eternal Sky. All the empires of the Celedon Highway have erupted into war, from Messaline to Song, and there is a hidden hand at work. Can a grandson of the Great Khagan and a Wizard of Tsarepheth bring about evil's defeat?