The season ends on January 30, 1932. Gereon has the chance to kill a Nazi leader but stops because Charlotte begs him not to become a murderer. That night, they listen to the radio: Hitler has decided to run for President against Hindenburg.
Stream it. But be prepared to feel sick to your stomach.
It is a masterpiece of historical fiction precisely because it removes the hindsight of "knowing Hitler wins." For the characters in Season 4, the Nazis are just one violent gang among many. The tragedy is that they are wrong.