People/CharactersHenry Landau, "Harry"

Henry Landau OBE was a South African World War I volunteer who served with the British Army's Royal Field Artillery when he was recruited into what is now known as the SIS (MI6). He was notable for handling one of the most effective espionage networks of the First World War, La Dame Blanche, and later wrote a number of bestselling novels about his experiences during the war.

Henry Landau (captain) in Wikipedia