The Secret Codebreakers: The Untold Story of Black Women Cryptologists and the War Against Stalin’s Bomb

Hidden Figures meets The Imitation Game in this never-before-told true story of the segregated Black code breakers who helped America win the Cold War, set amid the civil rights movement.

This is the shocking true story of the Black American codebreaking unit whose top-secret work led directly to the end of the Cold War.

Facing the global threat of a rising Communist world power in the aftermath of World War II, the US employed hundreds of Black Americans to speed read Russian communications and gather essential information on the US's most dangerous nuclear rival.

The result was the creation of a segregated civilian codebreaking unit known as the Traffic Processing Division - The Plantation. Despite wage discrimination, gruelling hours and harsh conditions, the Plantation's 100 college-educated Black women made invaluable breakthroughs in United States' Soviet intelligence, even as the backlash against civil rights eroded their democratic freedoms at home.

Sarah Valentine tells their remarkable story in full for the first time. Paying long overdue tribute to these little-known Black cryptologists' critical contributions to national security during the civil rights era and the Cold War.

'With relentless research and electric storytelling, Sarah Valentine restores the erased Black cryptologists who powered U.S. codebreaking from WWII through the Korean War. Urgent, revelatory, and impossible to ignore, Decoding the Devil unveils both the uncomfortable truths and the inspiring histories that form the foundation of our intelligence community' - Nathalia Holt, New York Times bestselling author of Rise of the Rocket Girls and Wise Gals

'A thought-provoking exploration of the lives and work of the largely forgotten, undervalued, and little-acknowledged Black (and mostly female) cryptologists who contributed to this nation's intelligence success during World War II and the early Cold War. These contributions were made despite physically uncomfortable and segregated workspaces and assignments far below their education and capabilities. Sarah Valentine tells a fascinating tale, deftly weaving the cryptologic work into the social and political constraints of the times' - Betsy Rohaly Smoot, author of Parker Hitt: The Father of American Military Cryptology

Book details

• Format: Hardback
• Pages: 368 pages, 8pp mono
• Publisher: Robinson
• Published: 04 June 2026
• Dimensions: 164 x 242 x 35 mm
• ISBN: 9781472148100