Babylon Berlin establishes an atmosphere reminiscent of fashionable German life in the 1920s. It begins as a detective story, initially conveying the feeling of a decade known for its liberated spirit—a freedom not seen again until the 1960s. A palpable sense of extravagance and indulgence is present, characterized by vibrant displays, revelry, and sexual openness. A carefully developed plot weaves together this detective narrative with developing political tensions and elements of cultism and militarism. These are early indications of a rigid, nascent nationalism that will eventually lead to the rise of Nazism—a stark contrast to the atmosphere of 1920s Berlin. The series features strong storytelling, impressive sets, and realistic portrayals of characters. The main characters in Babylon Berlin have imperfections; there aren’t any idealized heroes, just individuals living their lives. It doesn't avoid portraying the confusion and chaos that define many people's experiences—instead, it accepts them with straightforward honesty, which makes the series deeply absorbing. I know there are two versions available: one dubbed and another with subtitles. I would suggest choosing the subtitled version because something essential to the show seems to disappear with the somewhat lifeless voiceovers. The most recent season, number four, takes place at the start of the 1930s, a period marked by economic hardship, social instability, and the growing presence of Nazism. Ultimately, it’s an outstanding demonstration of what skillful writing, directing, and acting can achieve—and it was also Germany's most costly television production upon its release.

Source on TMDB