A science fiction epic from "the best writer in America" (Tom Clancy)--Hugo and Nebula award-winning author John Varley. Fleeing Earth after an alien invasion, the human race stands on the threshold of evolution. Their new home is Luna, a moon colony blessed with creature comforts, prolonged lifespans, digital memories, and instant sex changes. But the people of Luna are bored, restless, suicidal--and so is the computer that monitors their existence.....