Enigma

March 1943. Germany has suffered a series of heavy defeats, but the turning point in the war has not yet come, and in the English town of Bletchley Park, work is in full swing: a select team of cryptanalysts reads... the radio communications of the enemy naval forces. They are aided by the Germans' belief in the invulnerability of the "Enigma" - they do not know that the codes of their cipher machine have long been no secret to the English.
But suddenly the messages cease to be decipherable. The enemy has changed the codes, and now it is impossible to track the "wolf packs" of German submarines; for the Allies, this threatens enormous losses. Could a spy have infiltrated Bletchley Park? Suspicion falls on the mysterious beauty Claire Romilly…