I fairly recently heard about a detective novel but I can't remember either the author, title or character names, to search for it. I'm sure it was set partly on a Scottish island. Main character was I think sergeant, and was accompanied by a female very shy and scared of everything pathologist or forensic person. There was an old man in the book who knew about the murders but was now an alcoholic recluse.
If anyone can help from that rambling description I would be very grateful!