A New York Times Bestselling Author -- An elderly brother and sister open fire on the plaza below their apartment, punishing the people of Vig?ta for their sins. News cameras film Inspector Montalbano - gun in hand - scaling the building to capture the unlikely snipers. The inspector is hailed as a hero, but soon begins to receive cryptic messages in verse from someone challenging him to go on a "treasure hunt." Intrigued, he accepts - until the messages take a dangerous turn.