Mr Luparello, a renowned local engineer and leading political figure, is found dead in a car at a notorious prostitution spot on the outskirts of Vigata. The coroner rules that he died of a heart attack following an amorous encounter. Fending off pressure from prominent ecclesiastical figures who wish to keep the case under wraps and navigating the intricacies of local party politics, Montalbano goes about making sense of the available evidence, including the incongruous discovery of an expensive necklace found at the site of the murder.

A criminal turned state witness informs Montalbano of an arms stash in a cave just outside Vigata. Also uncovered in the cave is a secret chamber where the bodies of two lovers, killed sometime in the 1940s,were buried in a bizarre ritual. An intrigued Montalbano must challenge the Mafia and deal with the arms cache before he can investigate this second find.

A young Don Juan is found murdered in front of his apartment building and an elderly couple are reported missing after an excursion to the ancient site of Tindari. Inspector Montalbano tries to solve these twoseemingly unrelated cases amid the daily complications of life at Vigata police station. But when he discovers that the couple and the murdered young man lived in the same building, his investigation stumbles onto Sicily's brutal 'New Mafia' and leads him down a path more twisted and far-reaching than any he has ever been down before.