Hilda Campbell was born in the north of Scotland in 1889. She married German national Dr Willy Büttner Richter in 1912. They honeymooned in Scotland and returned to settle in Hamburg. Dr Richter died in 1938. After visiting her ailing parents, Hilda returned to Germany just before the Second World War began. She became a double agent, controlled by Gerhardt Eicke in Germany and Lawrence Thornto...