I'm currently reading non-fiction- yes, it does happen :) This one is about a serial killer who terrorized Florence, Italy from 1968-1989 or so. It's marvelously written by the Monstrologer (Mario Spezi, an Italian journalist who "specialized" in covering the case) and Douglas Preston (one of my favorite mystery/adventure authors). Both men were fascinated by the case, and ended up involved in ways neither could imagine. The main character in the story is the city of Florence itself, and the authors evoke such a sense of place with their descriptions and bring the people involved to life in their narratives.
I'm up to the point where Preston moves his family to Italy, should get even more interesting!