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? ‘His people are full-bodied, believable individuals, the minor characters as vivid as the main cast … a stunning story'The Wall Street Journal