Commissioner Theuer and his group are not assigned serious investigations by their superiors. However, when the Heidelberg police catch a drowned man from the river, about whom no one knows anything, the detective begins to develop this case, immediately suspecting that this is not an accident. It soon becomes clear that the deceased made his living from an illegal and unsafe craft. Theuer receives an energetic assistant in the person of a young employee of the prosecutor's office, Bahar Ildirim, but time is running out: a certain newcomer has settled in Heidelberg, who, fulfilling a secret order, walks over corpses.