(My review on goodreads)
This was one of the better of the recent Montalbano novels. It has nearly all of the elements that we should expect at this point in the series: a good mystery that plays by the rules (i.e. the reader knows what Montalbano knows); most of the usual cast of characters, acting in the way that they are meant to act; a few food references (though not enough, and nothing new). And it avoids things that have marred some of the recent episodes, such as a whiny Montalbano, an irrational Livia, and references to the fictional TV Montalbano.
In all, for the 23rd novel in the series, I thought this was a fine book and was in no way disappointed.