Unbreakable: The Spies Who Cracked the Nazis’ Secret Code


 by Rebecca E. F. Barone

 During 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 cypher–unless you could unlock the key to Germany’s Enigma machine. 

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