Nick Harkaway at Stratford-Upon-Avon Literary Festival

The bestselling author returns to the shadow world of his father, John Le Carre, for a new George Smiley adventure. 1965. The world is on a knife edge, and the Cold War is cooler than ever. British intelligence has one formidable clandestine asset in Moscow: a senior officer in the Red Army privy to deep Soviet secrets. But when a British agent is shot in Helsinki, Smiley uncovers a counter-intelligence operation putting Britain's star source in jeopardy.
Talking to Stephen Sackur