In the "Moka Efti", Charlotte Ritter (Liv Lisa Fries) overheard a conspiratorial round of a Russian diplomat, the Berlin policeman and a speaker of the Reich president. It is about the machinations of republican enemy traitors. Gereon Rath (Volker Bruch) receives a mysterious hint from the head of the "Moka Efti". Rath's assistant Jänicke (Anton von Lucke) makes an important discovery during the shading of Wolters.