London, Gollancz, 1992. First Edition. First Impression. Hardback. A very good copy. Inscribed by Pratchett thus: 'For Janet \ It MOVES!! | Terry Pratchett'. The author has accented the inscription with a large turtle sketch. The 13th Discworld novel. One of Pratchett's best novels, adapted successfully for Radio in 2006 by the BBC. Spine a little faded, owner's sticker to endpaper, name to pastedown, a couple of grubby spots. Cover art by Josh Kirby [7653, Hyraxia Books].