Read Oppenheimer: A World Destroyed, by David Boyle, for just 99p.

It was one of the biggest secrets of the war, the capture of a top secret Enigma machine from the radio room of the sinking submarine U110.

May 1941 marked the nadir of the Battle of the Atlantic, as Nazi U-boat attacks were crippling the nation's ability to survive. And the key to breaking that threat lay in deciphering the German's naval Enigma code.

But while Alan Turing and his colleagues at Bletchley Park worked tirelessly to crack the code, the working Enigma machine finally provided them with their breakthrough moment.

This book sets the story, and the Enigma cryptographers, in context - at the heart of the Battle of the Atlantic, when it reached its crescendo in the pursuit of the battleship Bismarck the week after U110 was taken.

David Boyle is a co-director of the New Weather Institute, and the author of a number of books about economics, business and the future, as well as history, including 'Blondel's Song' and 'Toward the Setting Sun', about the discovery of America.

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• HistoryMilitaryWorld War II

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• Print Length: 75 Pages
• File Size: 36 KB