A metropolis in turmoil. From economy to culture, politics to the underworld – everything is in the grip of radical change. Speculation and inflation are already tearing away at the foundations of the still young Weimar Republic. Growing poverty and unemployment stand in stark contrast to the excesses and indulgence of the city’s night life and its overflowing creative energy. Gereon Rath, a young police inspector from Cologne, is transferred to Berlin in order to solve a criminal case – a porno ring run by the Berlin Mafia. What at first glance appears to be simply a matter of extortion soon reveals itself to be a scandal that will forever change the lives of both Gereon and his closest associates.