In Discworld , unlike our own frustrating Roundworld, everything makes sense. The world is held up by elephants atop a swimming turtle, the sun goes around the world every day, and things always happen because someone intends them to happen. Millions of fans are addicted to Pratchett's Discworld, and the interest has only intensified since Pratchett's recent death and the release of his final Discworld novel, The Shepherd's Crown , in September 2015...