Author Ben Macintyre explores the truth behind one of the most famous double agents in modern history - Harold Kim Philby. He argues that Philby has become a caricature of the gentleman spy, obscuring the fact that Philby was a ruthless killer, who betrayed everyone around him. The key to Philby's success and his survival, Macintyre explains, lay in his friendship with a man that history has largely forgotten -... see more