Codebreakers : the inside story of Bletchley Park

Bletchley Park was arguably the most successful intelligence agency in world history, the top secret workplace of the remarkable people who cracked Germany's vaunted Enigma Code. Almost to the end of the war, the Germans had firm faith in the Enigma ciphering machine, but in fact the codebreakers were deciphering nearly 4,000 German transmissions daily by 1942. Indeed, Winston Churchill hailed the work of Bletchley Park as the `secret weapon' that won the war.