In the building of the Braunkirchen District Court, the speaker Markus Wagner is found shot dead. When the forensics team comes across individual plastic parts near the desk, it turns out for the SOKO that Wagner was murdered with a self-made weapon from the 3D printer. The first suspicion is directed against the taxi entrepreneur Stefan Ploderer, who had a violent dispute with the victim some time ago, but above all against the printer dealer Peter Hamsik, who has become conspicuous as a sympathizer of a right-wing extremist splinter group. However, the victim's secretary also knows about alleged cases of corruption within the authority.