A rash of burglaries has Inspector Salvo Montalbano stumped. The criminals are so brazen that their leader, the anonymous Mr. Z, starts sending the Sicilian inspector menacing letters. Among those burgled is the young and beautiful Angelica Cosulich, who reminds the inspector of the love-interest in Ludovico Ariosto's chivalric romance, Orlando Furioso. Besotted by Angelica's charms, Montalbano imagines himself back in the medieval world of jousts and battles. But when one of the burglars turns up dead, Montalbano must snap out of his fantasy and unmask his challenger.