The weapons of espionage are not ethical: lies, treachery, blackmail, violence - even murder sometimes.
Dusko Popov was one part of the complicated war of deception in the battle against the Germans, a man of courage and daring, who worked for the Allies, not only in London, but amongst and with the Germans.
In remembering some of the highlights of his career, he talks to Ewen Montagu , who also introduces the programme. Producer NATALIE WHEEN
Behind the 007 myth: page 5