The book is dedicated to the history of the hacking of the German Enigma coder by the British and Americans. It contains the answer to the most important question that has long remained unclear: was the role of the English and American codebreakers who cracked Enigma really so significant in achieving victory over Germany during the Second World War? The book also provides an objective assessment of the importance for breaking Enigma of special Anglo-American operations to capture the keys to Enigma, the betrayal of a high-ranking employee of the German encryption service and numerous miscalculations of the Germans themselves.