The series is pretty much about what the title "Black Widows" suggests. Three widows that decides they are better of without their better halves.
The three women have different and interesting personalities. Two different police officers with a very different methodology pairs up to investigate the murders of their husbands.
It's worth pointing out that this is just as much of a comedy that it is a drama. Which is good.
Unfortunately, there are quite a lot of plot holes and unrealistic twists (not revealing anyone to avoid spoilers) that felt like it wasn't properly scripted.
Also incredibly annoying that all the Swedish cars has the same letters in their license plates (all starts with MLB). It may seem like a minor detail, but it's really annoying especially for those who has a natural tendency to memorize things like that.
Definitely worth a watch, especially if you appreciate shows that doesn't take itself to serious.