London, Gollancz, 1962. First Edition. First Impression. Hardback. First UK hardback edition. One of Heinlein's juvenile novels, first published in 1950. Awarded a retro Hugo in 2001. The book is very good with just a little lean and some bumping to the spine tips. The jacket is good with a handful of tears and chips, one around 15mm to the fore-edge, a longer one to the upper spine tip. Similar to lower. The longest tear is to the top of the spine through the title and continuning to the rear. 20mm split to spine. A large chunk of loss to the head of the spine reinforced with brown tape. Lower spine tip similarly reinforced. Cover art by Alan Breese [7627, Hyraxia Books].