Roberto, a shy law student in Rome, meets Bruno, a forty-year-old exuberant, capricious man, who takes him for a drive through the Roman and Tuscany countries in the summer.

Sadistic no-count killer Nanni Vitali and three other equally brutish hoodlums escape from prison. The foul foursome embark on a savage rape, murder, and robbery spree. Vitali even abducts and defiles frightened hapless lass Giuliana Caroli. Meanwhile, rugged police inspector Giulio Santini is determined to bag the despicable Vitali.