The book describes the inner workings of the interwar American governmental cryptography organization called the Black Chamber.

"[1] By describing the inner workings of the organization, the book created large interest and heightened public awareness of the United States's cryptographic abilities.

Reviewers suggested the book may have cost the United States significantly in the Pacific theater against Japan in World War II.

[2] The book was made into the 1935 film Rendezvous starring William Powell and Rosalind Russell.

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