In this well-done novel by the prolific, award-winning author of Precursor and Fortress of Dragons, two women with superhuman powers wage psychic and genetic war for control of a civilization. The common people remember the original colonization of their desert world in purely mythological terms as the First Descent. They're unaware that their seemingly immortal ruler, the Ila, has used nanotechnology to control their lives and modify their bodies for survival on their harsh planet. Marak Trin Tain, the outcast son of a desert bandit who unsuccessfully contested the Ila's rule, suffers from a terrifying form of madness. Like many others in this world, he sees visions and feels an almost overwhelming desire to walk out into the desert, heading blindly toward the east.