What is the author's style in Death and Judgment by Donna Leon?

Because Venice is an integrated city that is visited by many tourists, a large number of people in the book speak English, albeit only when necessary. As with most regions, Veneto has its own dialect and accents. This is only evident when pointed out by the author, since Italian is used sparingly throughout the work. There is also the presence of people from other countries such as Brazil, Spain, and Bosnia, as well as those from adjacent countries such as Austria and Luxembourg.