His life was shrouded in secrecy and he left a remarkable legacy. He received decorations from the Spanish dictator Franco and Queen Elizabeth of Britain. He shook hands with a Hitler aide and swiftly rose to the top of the British intelligence service but the whole time he was in fact a Soviet agent. Many sought to unravel the Kim Philby enigma during his life and a quarter of a century after his death. It's still a subject of continuing debate.