"When Dottoressa Donato calls the Questura to report that a dying patient at the hospice Fatebenefratelli wants to speak to the police, Commissario Guido Brunetti and his colleague, Claudia Griffoni, waste no time in responding. 'They killed him. It was bad money. I told him no,' Benedetta Toso gasps the words about her recently deceased husband, Vittorio Fadalto. They discover that Fadalto worked in the field collecting samples of contamination for a company that measures the cleanliness of Venice's water supply and that he had died in a mysterious motorcycle accident. Piecing together the tangled threads, in time Brunetti comes to realize the perilous meaning in the woman's accusation and the threat it reveals to the health of the entire region"--Provided by publisher.