In the middle of a summer heat wave, as Naples prepares for one of its most important holy days, a renowned surgeon falls to his death from the window of his office. For Commissario Ricciardi and Brigadier Maione it is the beginning of an investigation that will bring them into contact with the most torrid, conflicting and enduring of human passions. In the world Ricciardi and Maione are about to enter, infidelity appears inextricable from the most joyful expressions of love, and, this interdepe