DR, you caught me with your title, two of my favorite subjects Italy and Wine not to mention a mystery. Its funny writing to make suggestions to an author if you have never written a book yourself, but I have read plenty and I favor mysteries. As another reader commented, it is a little hard to identify with a character when you do not know their name nor have clues about their appearance. When I read I am making a movie in my head as I go along I try and visualize what I am reading. Perhaps other do not do this but for the visual readers you may want to give them some of the external Sofi too, we get to learn a lot about  her inner life but she does not take shape as a physical being in the first chapter.