The Girl of His Dreams by Donna Leon
We've got two "mysteries" in The Girl of His Dreams, the death of the girl mentioned in the blurb and a potential scam being run by a man claiming to be a priest of some kind. Both are solved even if the resolutions aren't entirely satisfying, but I guess that's a bit like real life, not every mystery gets tied up in a neat little bow. Sometimes politics and money and being at the right place a bit too late all get in the way.
I like Brunetti. He's happily married and actually enjoys spending time with his family. He and his wife love books and conversation. While his superior is not ideal, he's not a loner, he works well with the competent members of the force. He cares about his case, perhaps more than he should at times.
While the mystery steers the book, the musings on life, death, religion, the mafia make it slower than the typical mystery. There is less...