Rath awakes after a long night to be faced with a new case – the massacre of the Red Fortress.
Gereon Rath is reunited with Helga, but his joy is short lived. With her mother dead, Lotte’s situation at home worsens.
Rath and Gräf undertake a dangerous mission to recover evidence of the secret German airfield based in Russia.
After discovering one of his most trusted colleagues has been murdered, Rath comes to suspect that the killer was someone on the inside.
Lotte is kidnapped and held in an ominously familiar location, while Rath and Benda’s case against the Black Reichswehr stalls.
Kardakov seeks help in retrieving the Sorokins’ gold. Rath faces a moral dilemma, and Bruno makes a power play.
Rath and Lotte race to stop the train robbery in time, while Greta’s conscience is torn when she falls into an assassination plot.
Rath and Bruno finally get a lead to the location of the missing film reel, but after the truth come the consequences.