Flavia and Fabio, a married couple, are found dead on the docks of Venice. She drowned, and he was stabbed to death with scissors. The police question Flavia's best friend Marzia, and a string of murders begins. Marzia's lover is shot in the kneecaps before being doused in petrol and set alight, while Marzia herself is tied to a kitchen table, dismembered, and stuffed in a fridge. Meanwhile, prolonged flashbacks suggest Fabio took joy in humiliating his young wife...