It's a book by Val McDermid, so you know it is well written, with an intriguing mystery.
That said, I really appreciated that it was situated during the height of Covid in the UK. This of course made for a different-than-usual investigation in itself.
But it also captures the timeframe of those days. Even if you lived in a place in the world where the implementation of the covid-rules was stricter / looser, it makes for an additional layer on the story that I really appreciated.