Through a Glass Darkly

It is a luminous spring day in Venice, as Commissario Brunetti and Inspettore Vianello take a break from the Questura to come to the rescue of Vianello's friend Marco Ribetti, who has been arrested while protesting against chemical pollution of the Venetian lagoon, only to be faced by the fury of Marco's father-in-law, owner of a glass factory on the island of Murano.