How did Frederick William Winterbotham’s 1974 book reveal the story of Ultra to the public?

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Ultra The British government established a code-breaking effort, known as Ultra, at Bletchley Park in Buckinghamshire, England, during World War II.

Frederick William Winterbotham revealed the existence of the Ultra project to the general public through his 1974 book, The Ultra Secret.1

During World War II, Winterbotham served as the official responsible for distributing highly sensitive intelligence derived from the German Enigma machine to Winston Churchill and Allied field commanders. By publishing his account, he broke the long-standing secrecy surrounding the code-breaking operations that had provided the Allies with a decisive strategic advantage against Axis forces.1