April 1964, but spring hasn`t quite sprung. The bad weather seems suited to nothing but bad news. And bad news is coming to the police station. First, Bordelli`s friend Casimiro, who insists he`s discovered the body of a man in a field above Fiesole. Bordelli races to the scene, but doesn`t find any sign of a corpse. Only a couple of days later, a little girl is found at Villa Ventaglio. She has been strangled, and there is a horrible bite mark on her belly. Then another little girl is found murdered, with the same macabre signature. And meanwhile Casimiro has disappeared without a trace. The investigation marks the start of one of the darkest periods of Bordelli`s life: a nightmare without end, as black as the sky above Florence.