London, Gollancz, 1990. First Edition. First Impression. Hardback. A nice copy. Inscribed by the author 'To Rob / It Moves!! / Terry Pratchett', with a contemporary signature. The tenth Discworld novel and the second stand-alone piece. Price-clipped with a little light edge wear, some dusting to the top edge. Cover art by Josh Kirby [6451, Hyraxia Books].