First edition, first impression. Jonathan Cape, London 1963. Jacket design by Raymond Hawkey. Len Deighton's second Secret File about a sunken German U-boat which has lain undisturbed in the deep water of the Portugese Atlantic coast since WWII until now (anno 1963).Inside are Nazi-secrets people will kill to obtain. 'Horse Under Water' sees its nameless, laconic narrator sent from fogbound London to the Algarve, where he must dive through layers of deceit in a place rotten with betrayals. Book is near fine with red boards with gilt lettering on spine and images of a black stamp and a blind imprint stamped on front cover. With crossword endpapers and a laid in reproduction of the original competition slip. Book has some mild soiling on topedges of the textblock and the boards. Dust jacket is near fine. Unclipped and correct priced (16s. net). Slightly tanned and creased on the top edges. Now preserved in a transparent adaptaroll sleeve.