In John Kessel's world, time travel has given humanity a great gift: the ability to exploit an almost infinite number of alternate pasts. And exploit it they have. Sightseeing tours to the crucifixion and front row seats at Caesar's assassination are just the beginning. But nice-guy Dr. Owen Vannice just wants to bring a dinosaur named Wilma forward for study. Then he meets August and Genevieve, a father-and-daughter con artist team, and together they land in the middle of a past revolt. "Entertaining, funny, and, best of all, highly serious," according to author Connie Willis.