This is another category that has so many worthy contenders, if your book did not make it on this list it is because I had to draw the line somewhere or perhaps you featured on another of my lists- sometimes categories overlap.
In no particular order:
Kingdom of the Blind – Louise Penny
The Portrait of Molly Dean – Katherine Kovacic
Anatomy of a Scandal – Sarah Vaughan
Reading, Writing and Riesling 
Love this category but haven’t read any from your list. Sooo many books…
2018 was a great year for books Tracey – so many 🙂