The message arrived on a Tuesday in October 1925, hidden inside a routine telegraph transmission from Chicago to New York. Clara Whitfield noticed it because she had been trained to notice things that did not belong.
The message read: MERIDIAN CONGRESS SESSION 447. PROPOSAL 23-B. ALL OPERATORS INDICATE YES OR NO BY PUNCH. CLOSE FRIDAY. Clara was twenty-four, tall, thin, and possessed of a mind that moved through information the way a key moves through a lock—finding the right combination without always understanding why. She worked for the State Department as a cryptanalyst, reading messages from foreign...
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