Ludwig Maria Pohl, known as Lupo, is just one colleague in the Weimar police department who is ignored by most of his colleagues. That changes abruptly when a bomb attack is carried out on him and shortly afterwards he is diagnosed with fatal ricin poisoning. He only has two days to live - Kira Dorn and Lessing have to find his killer. The inspectors determine that Lupo is the previously unknown son of the recently deceased owner of a traditional Thuringian porcelain factory. Lupo is entitled to a third of the considerable inheritance. His newly won sisters Amelie and Desiree Scholder are anything but enthusiastic about it. Both had a motive for murder.
Amelie's friend Ringo, who was imprisoned by Lupo five years ago and who has only recently been released, is also targeted. And what role does Ringo's mother Olga Kruschwitz play, who enforced Lupo's inheritance claim with a paternity test? Lupo has lovingly taken care of the old lady for the last few years. When the doomed man, in desperation, takes the head of the commissioner Kurt Stich hostage and thus wants to force the commissioners to hand over his murderer to him, the investigations experience a new dynamic.