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Lieutenant Aaron Donovan of the Office of Strategic Services embarks on a dangerous mission to get aboard a damaged German submarine and obtain the newest codebooks for the German Enigma cipher machine--will the mission be successful or end in disaster?
War storiesSpiesJuvenile fictionUnited States. Office of Strategic ServicesUnited StatesWorld War, 1939-1945FictionEnigma cipher systemSpy storiesCiphersWorld War (1939-1945) fast (OCoLC)fst01180924Children's fiction