Edgar Wallace 
Man Who Was Nobody [PDF ebook] 

Bearing a letter from her employer, Marjorie Stedman, confidential secretary and niece of Solomon Stedman, enters the drawing room of Alma Trebizond, actress and wife of Sir James Tynewood. Tynewood is unpleasantly drunk. When a second delivery is required Marjorie travels again to Tynewood Chase. Left alone by Doctor Fordham, she hears a shot. When she opens the door she discovers Sir James lying in a pool of blood. The man holding the revolver is someone Marjorie has seen before…