The synopsis on the cover said it all
Gotland is a small part of Sweden. I get the impression that not a lot goes on there.
Not enough murders to generate a long series of mysteries. Although that didn't stop Oxford being the location for the excellent Inspector Morse books.
I found 'Unspoken' easy enough to read with few unusual translations. The story had a good pace, albeit rather straightforward. It seemed that clues would appear at a reasonable rate and the murders would get solved. And they did.
What it said on the cover was about right. Enough said.