Bletchley Park's WWII codebreaking is famous, but its WWI counterparts remain in the shadows. From the Marne to the Zimmermann Telegram, a cast of eccentric characters secretly guided the Great War from smoke-filled rooms.

Bestselling author Paul Gannon uses intercepted German messages to reveal British codebreaking operations. Discover newly uncovered archival documents that challenge misleading stories about Room 40 & MI1(b), revealing a sophisticated machine in operation. Perfect for readers interested in military history, intelligence, and cryptography.

About the Author

Paul Gannon is a science and technology writer. He is the author of Colossus: Bletchley Park’s Greatest Secret (2006) and Trojan Horses and National Champions Crisis in Europe’s Computing and Telecommunications Industry (IT Book of the Year 1997).

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