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Published by Weidenfeld & Nicolson, 1976, hardcover, index,, 198 pages, condition: basically as new.
The author was a British Royal Air Force officer (latterly a Group Captain) who during World War II supervised the distribution of Ultra intelligence. His book The Ultra Secret was the first popular account of Ultra to be published in Britain. Ultra remained secret even after the war. Then in 1974, Winterbotham's book, The Ultra Secret, was published. This was the first book in English about Ultra, and it explained what Ultra was, and revealed Winterbotham's role, particularly with regard to the dissemination and use of Ultra.
There had been mentions of Enigma decryption in earlier books by Władysław Kozaczuk, Ladislas Farago and Gustave Bertrand. However, Winterbotham's book was the first extensive account of the uses to which the massive volumes of Enigma-derived intelligence were put by the Allies, on the western and eastern European fronts, in the Mediterranean, North Africa, and perhaps most crucially, in the Battle of the Atlantic.