Rath and Bruno finally get a lead to the location of the missing film reel, but after the truth come the consequences.

Lotte's private investigation leads her to the depot where the hijacked train is held. Rath relives painful memories of the front.

Kardakov seeks help in retrieving the Sorokins' gold. Rath faces a moral dilemma, and Bruno makes a power play.

As Berlin becomes increasingly politically charged, those in charge look to change the discourse on the May Day violence.

The May Day stand-off between communist protesters and police erupts in bloody violence.

Kardakov flees after the Soviet attack on The Red Fortress. Rath receives an uninvited guest in his apartment.

Rath attempts to interrogate König further regarding the missing film reel, while the Russian revolutionaries' location is revealed by an informant.

In 1929, a freight train traveling from the Soviet Union is hijacked. Meanwhile, Chief Inspector Gereon Rath from Cologne pursues a mission in Berlin.