I'd twigged who the murderer was by halfway through episode four but couldn't be absolutely sure because I couldn't work out the motive. When it came, I was pretty stunned and didn't believe in the explanation offered.
During the first three episodes I'd had this feeling that one particular person was the actual murderer but it just didn't sit right and the programme was making it pretty clear that they weren't. That could have been a red herring but it wasn't a conventional one so I discounted those thoughts. By episode four however the miscreant was clear.
There was a bit of Sweden is good and the States are bad about the series. It certainly showed the ugliness of American politics and politicians as well as public discourse. That's not an exageration though, but the Swedish police were portrayed in an overly sympathetic light which they don't deserve particularly.
The series pulled no punches in places but it was uneven overall.
Worth a watch but not utterly compelling.