Doctored Evidence by Donna Leon

A nasty old woman that no one likes is murdered and the blame falls (courtesy of the incomparably incompetent Lt. Scarpa) on the abused Romanian servant who is chased under the wheels of a train by the persistent Lieutenant and his merry men. Brunetti, of course, manages to get it all straightened out with the assistance of the amazing Signorina Elettra and Vianello. I wonder if people from southern Italy really are named Scarpa.