Presented by Mark Lawson. In a special interview Mark talks to writer David Cornwell, pen name John Le Carre, whose latest novel A Most Wanted Man examines Hamburg's role in the War on Terror. David Cornwell talks about the new novel and how it fits into a career spanning his days working as a young official in the British Consul, to when he crossed over from being a spy to become a writer of books about espionage - including A Perfect Spy, his most autobiographical work revealing how the experience of having a con-man father prepared him for life in the secret service.