From MHz Choice:

MYSTERY | ITALY | ITALIAN WITH ENGLISH SUBTITLES |
Inspector Federico Vivaldi is an old-school cop in a new world: his son is gay, his wife has left him and he’s got an ambitious colleague nipping at his heels to take over his position. He may be old-fashioned but he’s resilient enough to find his way in the new reality. His son, Stefano, is also a cop, and father and son make a good team solving crimes together in the northeastern Italian city of Trieste.

From MHz Choice you can stream Season 1 consisting of 8 episodes, each about 1.5 hours. All 8 episodes are dedicated to one continuing mystery with lots of side distractions.

If you want to hear understandable Italian, this detective soap opera is for you. Sometimes the acting is terrible. Sometimes the presentation is corny (can you hear those violins?) Finally I decided I could not stand Inspector Vivaldi as a person. But his son and his beautiful former wife are appealing.

Somewhat mediocre but it is ITALIAN!!! (Who is prejudiced?)