Desc: Der Knabe in Blau: Directed by F.W. Murnau. With Ernst Hofmann, Blandine Ebinger, Margit Barnay, Karl Platen. Thomas von Weerth lives as the last descendant of an aristocratic family in the decayed castle. He is fascinated by the picture, 'The Boy in Blue', which shows the so-called Death Emerald.