Enigma - Robert HarrisArrow, 1996, Paperback.
Condition: Near Fine.
From the cover: “March 1943, the war hangs in the balance, and at Bletchley Park a brilliant young code breaker is facing a double nightmare. The Germans have unaccountably changed their U-boat Enigma code, threatening a massive Allied defeat. And as suspicion grows that there may be a spy inside Bletchley, Jericho’s girlfriend, the beautiful and mysterious Claire Romilly, suddenly disappears.”