Nancy Kress ends her Beggars trilogy (which began with the novella later turned into a novel, Beggars in Spain) almost full circle from where it began. Against a backdrop where rich humans have themselves modified to perfection and poor, unmodified "Livers" eke out a nomadic existence, the genetically superior Sleepless have stopped distributing Change. Change is the miracle substance that prevents disease in all humans. In cutting off Change, the Sleepless have ignited a class war that will ultimately be resolved not by technology and science, but by the children of technology, who must live side-by-side despite their differences.