1922 film by Scott R. Dunlap

1925 film by W. S. Van Dyke

mystery/thriller novella by Jackson Gregory (McBride's, April 1916)

pulp novella by Jackson Gregory

edition by Jackson Gregory

1917 film by Otto Hoffman

book edition published in 1930

book edition published in 1930

book edition published in 1929

book edition published in 1929

book edition published in 1929

book edition published in 1928