Berlin, April 1929: Cologne police lieutenant Gereon Rath is transferred to aid Bruno Wolter in the investigation of a porn ring in Berlin.
Gereon Rath’s interrogation of porn producer König gets out of control. Meanwhile, the Russian revolutionaries are betrayed when their location is revealed by an informant.
Kardakov flees after the Soviet attack on The Red Fortress. Rath receives an uninvited guest in his apartment.
The May Day stand-off between communist protesters and police erupts in bloody violence. Inspector Bruno finds a way to uncover Rath’s intentions.
As Berlin becomes increasingly politically charged, those in charge look to change the discourse on the May Day violence. Meanwhile, Lotte gets in over her head.
Kardakov seeks help in retrieving the Sorokins’ gold. Rath faces a moral dilemma, and Bruno makes a power play.
Lotte’s private investigation leads her to the depot where the hijacked train is held. Rath relives painful memories of the Front while at an evening soirée.
The police make an example of Nyssen. Rath and Bruno finally get a lead to the location of the missing film reel but after the truth come the consequences.