Commissioner Andreas Rauscher could actually enjoy his well-running relationship with Commissioner Jana Kern, but the case of the murdered EU politician Hans-Georg Schumann is weighing heavily on him. Schumann wanted to introduce a new law that would limit the consumption of apple wine to 200 ml per day. According to a new study by a Berlin professor, it is too acidic and therefore harmful to health. The investigations initiated are quickly successful: the Frankfurt homicide commission is led to Karl Wöhr. The apple wine lover saw Schumann and his proposed legislation as a thorn in his side. His motive seems crystal clear, and the murderer is quickly apprehended. However, Rauscher is not willing to accept this. Over the heads of his colleagues, he continues to investigate and soon uncovers some inconsistencies...