Commissioner Gereon Rath (Volker Bruch) is drawn with his colleague Bruno Wolter (Peter Kurth) in the bourgeois-warlike disputes of May 1. After the autopsy of a murdered Russian revolutionary, Rath and Charlotte Ritter (Liv Lisa Fries) decided to make joint investigations. Charlotte takes her girlfriend Greta (Leonie Benesch) to the "Moka Efti" and becomes a victim of blackmail. Kardakov's lover Swetlana secretly conceals the wagon of the revolutionaries.