During World War II, Japanese intelligence broke nearly every Allied military code—except one. This is the incredible true story of the Navajo Code Talkers, the U.S. Marines who created the only unbreakable military code in modern history. In 1942, the United States turned to an unexpected weapon: the ancient and complex Navajo language. Spoken by fewer than 200,000 people and unknown outside the American Southwest, Navajo became the foundation of a revolutionary code that Japanese cryptanalysts