Vienna Blood | Series 4 Preview (BBC Two)

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

When the meeting is ambushed, he is compelled to seek the identity of a high powered traitor who threatens the very existence of the empire. He, of course, needs the help of Max, who has recently returned from a very successful tour of America.

Vienna Blood returns Sunday 4th August on BBC Two.