This was a first for me in many regards. My first Donna Leon book (by extension my first Brunetti), my first foray into the mystery genre, my first police protagonist, my first story set in the realworld, and so on. Ergo, I expect the following to smack a little of the kind of delight only to be found in naivety and ignorance, so take it with a pinch of salt (or a few sachets, whatever suits your taste).
I'll get this out of the way first; this is an intelligent read. The option of jumping a few lines, even if by accident, carries the inevitable snare of dooming oneself to turn back, pages - sometimes even chapters - later, scanning for what was missed. The narrative is dense, adhering well to Vonnegut's Fourth Rule, yet at the same time feels no urge to take the reader by the hand and guide their every footstep; instead trusting that, like Commissario Brunetti, you will figure it out by yourself. While this may seem like high expectations, given the man's profession, his accessibility as a character allows one to quite easily walk in his shoes, and see the world through his eyes.
The plot itself, without giving spoilers, is an autonomous machine. It spends the entire book gathering bits and pieces of itself, and then only later begins to weld them together, with the final rivet going in at the final line of the final chapter. There is no added drama, no embellishment, no mention of any of the characters celebrating or congratulating each other (an echo of the realworld, I would hazard); all of this is in the subtext. Leon does not insult the reader's intellect by spoon-feeding how the characters feel, as you the reader are doing all the feeling for them.
I recommend this book to anyone with a reasonable IQ and two working hands, but I myself will be taking a break from this genre for the present. As I've made clear above, this is not the fault of Leon, but after finishing this story set in what I presume is a faithful depiction of Venice, I find myself craving something a little more ... escapist. Still, for those who have had their fill of such things, if only for the moment, go out there, and pick this up. Like any good story, it takes its time, and is all the more satisfying in its conclusion for it.