Max Liebermann, estudiante de Sigmund Freud, ayuda al detective Rheinhardt en la investigación de una serie de asesinatos inquietantes en los grandes cafés y teatros de ópera de la Viena de 1900.
Vienna, 1909. Oskar is baffled when the director of security agrees to a secret rendezvouz with a notorious, recently captured criminal.
With Max in the hospital, Oskar is racked with guilt but is determined to unmask the traitor in the heart of the Austrian establishment. He realises just how powerful this enemy is when he finds himself framed for murder.