A distressed woman arrives at Vigata police station to report the disappearance of her brother. Soon enough, the man is found murdered in what appears to have been a crime of passion. But Montalbano is reluctant to give too much credit to appearances and digs into the victim's past, talking to anyone who might have had an involvement in the case. Meanwhile, a number of high-profile businessmen and politicians die as a result of cocaine overdoses.

As torrential rain pours down on Vigata, a plastic bag containing a body cut into pieces is found in a clay field. All the signs point to an old-fashioned Mafia killing. But why is Montalbano's trusted colleague and friend Mimi Augello suddenly irritable and short-tempered, and why is he insisting that the investigation be assigned to him? Could Mimi somehow be involved in the case?

Fazio is missing. He's not at home, his mobile is switched off and his father is worried. Believing that the young officer had been working a secret investigation on his own, Montalbano fears that Fazio may be in serious trouble and a frantic search is mounted in an effort to find him alive.