Amazing "mise en scene" and cinematography. Very interesting characters, fine actors. Very cool stories. Great location. Naples scenery and architecture are wonderful. This is about as good as streaming gets! The main detective is objective, driven, and humane. The secondary "crew" are very fascinating. You can't "outguess" what the mysteries will reveal. Subtitles work well, as they should.
Sometimes Italian streamed shows are too esoteric or too cute. This is very sophisticated and satisfying.
Each character among the police crew has a "secret" or background story that is important in its own right. "Giorgio Pisanelli" is one of the more intersting and mysterious ones. But every single one of them has a back-story worth consideration.