A man falls from the top floor of a posh hotel in Vienna. Iranian diplomat and nuclear physicist Dr. Bansari appears to have committed suicide. But why did he buy expensive opera tickets for the same evening? Moritz Eisner (Harald Krassnitzer) and his colleague Bibi Fellner (Adele Neuhauser) want to investigate the issue, but the Iranian Embassy and the Austrian Foreign Ministry immediately get involved. The case is subject to the strictest secrecy – the dead man's laptop and mobile phone are confiscated. The two investigators are pissed off, but don't give up. The surveillance video of the hotel leads them to the trail of the shady lobbyist Johannes Leopold Trachtenfels-Lissé (Udo Samel). This has with Dr. Bansari brokered a secret deal.
Eisner and Fellner find out it's about valves and pumps needed for nuclear reactors. A trainload of the high-quality components is to be sent to Iran via third countries. A race against time begins for the two investigators – and against the Israeli secret service Mossad. In this "crime scene" Moritz Eisner and Bibi Fellner have to find their way through a thicket of murder, corruption and high-tech smuggling. Harald Krassnitzer and Adele Neuhauser have long been a well-established team as Austro investigators, and the two were even awarded the renowned Adolf Grimme Prize. But they haven't had to bring a full-speed freight train to a standstill.
And they haven't had to deal with "Kidon" - a special unit of the Israeli intelligence service responsible for assassinations. In addition to Tanja Raunig, Hubert Kramar, Eva Billisich and Stefan Puntigam, the character Udo Samel can be seen as a sophisticated fashion designer and wily lobbyist.