"The Investigation" starring Soren Malling is a six-episode series on HBO. Understated, muted, and snail's pace slow--with subtitles of course--it focuses entirely on the investigation of the murder of a Swedish journalist.
The acting carries the show, along with excellent photography. No murder scene, few glimpses into domestic lives, spare dialogue, and no romance or courtroom drama, all six episodes cover the months of investigation by a group of Danish detectives into a horrific 2017 actual crime.
"Mare of Easttown" is another worth-watching HBO murder mystery --airing on Sunday nights, but the first two episodes are streamable. Kate Winslet plays (impressively) a small town Pennsylvania police officer in a town where everybody knows everybody.
If you don't like murder but you like mystery, these two are totally engaging in very different ways.
In both--as in so many crime-solving stories--the people investigating the crimes, totally obsessed with their cases, have crumbling personal lives and seemingly unsolvable problems. I find this fascinating.