I read a few reviews about this while I was reading it and I have to agree a bit with some of the criticism that it's a bit same-old. However that's also part of the charm of the Inspector Brunetti books: finding again the familiar streets of Venice, the food, the family dynamic, the often lax police procedures of Italy.
The plot involves the theft of rare books but a murder also takes place which is connected to the thefts. There are the usual set of characters, police and shady types. It's a good quick read and enjoyable enough - like discovering a old friend.