Inspector Gereon Rath uncovers a dangerous web of shadows when investigating 1929 Berlin's seedy underbelly.

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

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

The May Day stand-off between communist protestors and police erupts in 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, while Lotte finds an accomplice. Rath faces a moral dilemma, and Bruno makes a power play.