Author's The red stain ... 1915.

www.kirjasto.sci.fi/abdullah.htm: pseud of Alexander Nicholayevitch Romanov, Russian born British novelist and short story writer, born in Yalta of Russian-Afghan parents, lived in Afghanistan, educated at Eton and Oxford, served in British Army for many years, lived in U.S. from 1920s until death

IMDB, 6 June 2016 (Achmed Abdullah; writer; real name Alexander Nicolayevitch Romanoff; author of numerous adventure and mystery stories set in strange and exotic locations; born 12 May 1881 in Yalta, Taurida Governorate, Risssian Empire; died 12 May 1945 in New York City)