Season 2, Episode 1 of Babylon Berlin initiates with Detective Gereon Rath investigating a mass grave, while tensions rise regarding his relationship with Charlotte Ritter and the arrival of Helga Rath. The episode further explores political conspiracies in the Weimar Republic and the Black Reichswehr, a topic detailed in depth by the Goethe-Institut . Babylon Berlin S 2 E 1 Recap - TV Tropes