"A nonfiction manuscript for young readers about a group of Allied spies and codebreakers that cracked the Nazis's infamous cypher, allowing them to read secret military messages and turn the tide of World War II. 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...

"From spy schools and ciphers to sneaky tools and secret armies, this guide takes you on a declassified tour of the undercover operations that helped decide the outcome of World War II. There's also more than a dozen short 'spy-ographies' that cover some of the most famous (and infamous!) agents who were active during the war." -- Back cover.