Magnificent story-telling, meticulously researched. A fascinating commentary on the height of the Cold War' Peter Snow The astonishing true story of the West's greatest espionage operation of the Cold War - and the Soviet mole who betrayed it. Its code name was "Operation Gold," a wildly audacious tunnel into East Berlin to tap into critical KGB and Soviet military telecommunication lines. Success would provide the CIA and the British Secret Intelligence Service access to a vast treasure of intelligence. Yet as the Allies were burrowing into the German soil, George Blake, code-named Agent Diamond by his Soviet handlers, was burrowing into the operation itself. . . A heart pounding account of bluff and double bluff, Betrayal