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Unbreakable: The Spies Who Cracked the Nazis' Secret Code Children's Heavy Machinery Books In this fourth wall–breaking graphicDuring WWII, as the Germans waged war, every Nazi plan, every attack, was sent over radio. But to the Allies listening in, the messages sounded like gibberish. The communications were encoded with a powerful cypherunless you could unlock the key to Germany's Enigma machine. Featuring historical photos, Unbreakable tells the story of one of the most dangerous war time code breaking efforts ever. As Hitler marched his troops across conquered lands and