Code Breaker, Spy Hunter: How Elizebeth Friedman Changed the Course of Two World Wars

This biography recounts Elizebeth Friedman's work in early United States cryptology. Using paper and pencil, she helped stop rumrunners and later investigated Nazi activities through counterespionage. Her role remained largely hidden until her secret papers were declassified in 2015. The book focuses on the code-breaking work that took place across the era of two world wars and on Friedman's part in it.