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This is one of only three books about Bletchley Park to be written by someone working there in a senior capacity for virtually the whole war. This lends it a rare degree of authenticity. Of course, a 158-page book can not be, in any sense, 'complete', but it does offer an excellent overview of the Bletchley/Enigma story, with sections on BP, the Enigma machine, codebreaking, deriving usable intelligence from decrypts, and most valuably, an informed assessment of how the decrypted information helped the Allies bring the war to an end. Authentic, and with a broad coverage, this is the best choice for anyone wanting to read just one book on this subject. --This text refers to the Paperback edition.