 His first feature-length film, "The Boy in Blue" (1919), a drama inspired by the Thomas Gainsborough painting.He explored the theme of dual personalities, much like Robert Louis Stevenson's "Dr. Jekyll and Mr. Hyde", in "Der Janus-Kopf" (1920) starring Veidt and featuring Bela Lugosi.Murnau's best known film is "Nosferatu", an adaptation of Bram Stoker's "Dracula" (1922), starring German stage actor Max Schreck as the vampire Count Orlok.