Ein Gangsterboss sitzt seine zehn Jahre im Knast ab. In dieser Zeit plant er den Supercoup, der ihn unvergesslich machen soll. Das Ziel seines Raubzugs ist ein Flugzeug, das Brillanten transportiert, gesichert von Spezialeinheiten der Polizei und einer Armee von Sicherheitskräften. Er stellt eine Truppe von "Experten" zusammen, die garantieren sollen, dass der Überfall reibungslos klappt. Doch er ist nicht der einzige, den die funkelnden Steine interessieren.

Two friends from America come together by chance in the Italian countryside. They decide to meet in Rome after both have done private deals. When one then not show up in Rome starts the other one become suspicious and fearful that something has happened to him. He begins to investigate the case himself and ends up in a spiral of industrial espionage, blackmail, and cold-blooded murder ...

Young nobleman Mino lives with his mother and Marta, the housekeeper, in an old, decaying castle. He is infantile and morbidly attached to the weird duo; his only hobby is taxidermy. Laura, Mino's fiancee, is met with jealousy and hatred by the two women, and decides to leave the castle; but Marta sabotages her car brakes and she is killed. Mino takes her body back to the castle. Meanwhile, his mother is violently arguing with Marta, who throws her down the stairs and repeatedly bashes her head on the floor. The distraught Mino descends into madness: he picks up a stripper at a nightclub and brings her home, then strangles her while having sex next to Laura's dead body. He does the same with a prostitute. Marta discovers these murders and offers to help dispose of bodies. A year later, Daniela (Laura's twin sister) arrives at the castle...