Henry Landau OBE (7 March 1892 – 20 May 1968) 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 as the handler of one of the most effective spy rings of the First World War, La Dame Blanche, and later wrote a number of bestselling novels about his experiences during the war. (From Wikipedia)
More about Henry Landau:Books by Henry Landau:
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Landau, Henry, 1892-1968: Secrets of the White Lady (New York: G. P. Putnam's Sons, c1935) (page images at HathiTrust)
Additional books by Henry Landau in the extended shelves:
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Landau, Henry, 1892-1968: All's fair; the story of the British secret service behind the German lines (G.P. Putnam's sons, 1934) (page images at HathiTrust)- Landau, Henry, 1892-1968: The enemy within; the inside story of German sabotage in America (G. P. Putnam's sons, 1937) (page images at HathiTrust)
Find more by Henry Landau at your library, or elsewhere.