Futrelle: The problem of cell 13, The scarlet thread, The man who was lost, The great auto mystery, The flaming phantom, The mystery of a studio. O. Crawford: Gentleman Coggins, alias Towers, The murder at Jex farm. H.C. Rowland: The border. Baroness Orczy: The Fenchurch street mystery. L.J. Vance: The mystery of seven minutes