Watch Fmovies. An adaptation of the sixth book in Terry Pratchett's Discworld fantasy series, performed by Divadlo v Dlouhé. On Discworld, which is flat and travels through space on the back of a giant turtle, unimaginable things began to happen when three witches—Granny Weatherwax, Nanny Ogg, and Magrat Garlick—became involved in royal politics. They did not like the cruel rule of Lord Felmet, who ascended the throne after murdering King Verence, who thus became a ghost.