From MHz Choice:

With Germany, Switzerland and Austria sharing its shores, Lake Constance has stories to tell. German homicide inspector Micha Oberländer and his Austrian partner Hannah Zeiler try to discover its secrets and have a few of their own.

From MHz Choice you can stream two seasons of this  German-Austrian TV crime series which is shot at  Lake Constance.  Season one consists of 7 episodes. Season two consists of 3 episodes. All episodes last about an hour and a half.  German with English subtitles.

Germany and Austria decide to create a small detective unit with dual authority in both countries. Initially the German Micha and the Austrian Hanna don’t get along together.

Each episode is a self-contained crime and solution. Running throughout all 10 episodes are two themes:

•     Micha’s marriage is unraveling, mostly due to the usual   detective cliché that he is always on the job.
•     Hannah is a stone-faced cold young woman whose life was tormented by the disappearance of her father.  Eventually her father appears.

Probably Hannah will never succeed in a relationship. However as the series progresses a genuine friendship develops between Micha and Hannah.

If you can sit still for an hour and a half, then this series is worth the time spent watching.