Still in hiding, Oskar identifies high-powered suspects but can’t connect them to Mephisto. When Oskar arranges a rendezvous with Mephisto, he finds himself in the middle of an assassination attempt that could precipitate a world war.

Max is in a coma and the doctors don’t know if he will survive. Oskar is racked with guilt and continues to investigate.

A murder takes Oskar and Max’s investigation into a world of underground gambling. Oskar’s life continues to be complicated by his feelings for Therese. Max questions if he and Clara are meant to be together.

Vienna, 1909. Oskar is baffled when the director of security agrees to a secret rendezvous with a notorious, recently captured criminal.

Working together in a crime-solving partnership, brilliant young English doctor Max Liebermann and tenacious Detective Inspector Oskar Rheinhardt investigate a series of unusual and disturbing murders. Max's extraordinary skills of psychological perception and Oskar's forceful determination lead them to solve some of Vienna’s most mysterious and deadly cases.