I'm a big fan of Terry Pratchett to begin with, so feel free to take this with a grain of salt. I think this is one of Pratchett's strongest books. Themes addressed include fanaticism, feminism, the effect of technology on our world, fear of change, and the struggle faced by people as they confront a history that made racism acceptable. An enjoyable read that in typical Pratchett fashion raises questions through humor that leave you thinking long after your initial guffaw has passed.