Investigating soviet espionage and subversion: the case of Donald Maclean

This essay sets out the dimensions of investigating Soviet espionage and subversion, highlighting how Maclean's image as a Soviet agent has developed over the past 50 years. It will then consider to what extent new documents at the Public Record Office alter his image. Maclean's crime was treachery but what exactly is the intellectual challenge in investigating espionage? Just what can be achieved? Sir Dick White former head of MI6 offered this advice: Espionage is a crime that often leaves no trace of evidence. The investigator relies upon intuition for coincidences. After considering the circumstances, he might reach the moment of epiphany when all the facts added up to one conclusion¹