The unforgettable conclusion to the ground breaking trilogy begun with the Nebula Award-winning "Beggars in Spain". Two hundred years in the future regular human beings hate and fear the Sleepless and the SuperSleepless, genetically modified humans who are immune to disease and hunger, and need no sleep. When the Sleepless plot to take over the world and leave regular humans powerless, civilization and the very meaning of the word "human" hang in the balance.