For a while after he was reappointed as First Lord of the Admiralty in September 1939, Winston Churchill was outwitted by a disgruntled Russian émigré who made dresses for the Duchess of Windsor and sold the best caviar in London in her South Kensington tea room. She smuggled secret letters between Churchill and President Roosevelt to Berlin. Was she also the link with a German spy in the Admiralty and the German Navy? Churchill’s Mole Hunt is a historical novel that trawls through the bitterly cold London of the winter of 1939 and 1940 to catch the Nazi spy, meeting along the way Churchill, Ian Flemming, members of the Right Club, MI5’s notorious Maxwell Knight and sultry spy Joan Miller.