Smiley and his people are facing a remarkable challenge: a mole - a soviet double agent - who has burrowed his way in and up to the highest level of British Intelligence. His treachery has already blown some of their vital operations and their best networks. The mole is one of their own kind. But which one?
This programme focuses on the largest sea-borne invasion in modern history and one of the world's most tightly kept secrets. It brings together despatches from the BBC War Correspondents who brought up-to-the-minute, graphic descriptions of the events to the listening public. This is a unique collection, a chance to hear history in the making: the day and the hour of D-Day June 1944.