Unbreakable: The Spies Who Cracked the Nazis' Secret Code

Unbreakable is the edge-of-your seat true story of the codebreakers, spies, and navy fighters who helped defeat the Nazis and turned the tide of World War II—perfect for fans of The Imitation Game, Alan Gratz, and Jennifer Nielsen.

"A thrilling adventure of intrigue and daring worthy of the best James Bond stories." —James Ponti, New York Times best-selling author of City Spies

As the Germans waged...