In the fourth season's encompassing two-episode story, "Mephisto Waltz," Dr. Max Liebermann (Matthew Beard) and Inspector Oskar Rheinhardt (Jürgen Maurer) face their greatest challenge yet when 1909 Vienna is rocked by the assassination of a senior public official... and the inexplicable murder of a notorious arms dealer while in police custody. Is there some conspiracy linking the slayings? Amelia Bullmore, Conleth Hill, Charlene McKenna, Luise von Finckh also star. 180 min. Widescreen; Soundtrack: English.