Gereon Rath, a young inspector from Cologne, is transferred to Berlin to solve the criminal case of a ring run by the Berlin Mafia. What at first glance seems to be simple blackmail soon turns out to be a scandal that will change Rath's life and that of his closest confidants forever. Together with the stenotypist Charlotte Ritter and his partner Bruno Wolter, Rath is confronted with a jungle of corruption as well as drugs and arms trafficking, which plunges him into an existential conflict between loyalty and finding the truth. Because who is friend and who is foe in this story? The third season begins shortly before the devastating stock market crash of 1929, this time Gereon Rath investigates the case of actress Betty Winter, who died during filming at the Babelsberg film studio. Is it an accident or murder? In addition, the Benda case is not yet closed for Rath and Charlotte: Greta is on trial for the assassination attempt on the government council. The fourth season takes a new look at the powder keg of Berlin. American Abraham Goldstein has returned to find a stolen jewel from his father. Rather incidentally, Goldstein ignites a gang war, in the course of which the structure of the underworld changes from the ground up. And Commissioner Rath has no idea that the pact with the devil will reignite the fight against his inner demons. The journey into the night has only just begun.