From Booklist
Busby, one of sf's enduring maestros of space opera, delivers another trademark romp through a richly imagined future. Following a political protest at a Washington State University football game at which a frenzied crowd is improbably and instantly pacified, Luke Tabor, a graduate student in physics, discovers that Derion, the man who controlled the crowd, not only has astonishing mind-over-matter abilities but comes from another time. When Luke and his friends are later arrested for the uprising, Derion whisks them off to an era when humanity has been divided through long genetic manipulation into the Changed and the Unchanged. Among the Changed are Derion and his archenemy, Lord Frey, both of whom occupy "islands" apart from the flow of time and are pioneers at traveling into the past. While steadily gaining control of the surrounding bizarre technology, Luke and other abducted contemporaries are caught between Lord Frey's objective of using them as genetic guinea pigs and Derion's time-hopping battle against Frey. Busby's future is brimming with fanciful artifacts and an almost cartoonish cast of principals, but every improbability is sustained by the author's perfect touch of whimsy.
Carl Hays
Ingram
Transported through time to an earth of the distant future, Luke Tabor discovers that a genetic disaster has led to overbreeding, and he is coveted to enhance the earth's weakening gene pool.