A flurry of flashbulbs in Salzburg's Hotel Menuett. At a press conference, Bavarian Energy Minister Wittmann and Salzburg State Parliament President Zirner announce the energy turnaround: Biogas. The enterprising entrepreneur Nussbaumer is to drive this forward with his new biogas plant. In the audience: Chief Inspector Mur, acting as undercover personal security for Wittmann, Hofrat Seywald, an old school friend of Nussbaumer, and his husband Rene. They are called in when Wittmann's chauffeur falls out of the limousine dead in front of everyone. The suspicion is obvious. Poisoning out of jealousy? Irene Russmeyer of the Salzburg CID and the Bavarian chief inspector Mur are not at all in agreement. The clues lead them to an explosive opponent of private energy supply, to the Salzburg Marionette Theatre and to an Azerbaijani gas prince named Gorkinski. A dangerous political conspiracy becomes increasingly clear, mixed with explosive private motives and demanding everything from our investigators.