In Stefano Mordini’s film, based on Edoardo Albinati’s fact-based novel of the same name, a group of young, privileged men commit a disturbing crime.

The story starts like this: A woman hears a noise — it sounds like a cry for help — from her apartment in a tony neighborhood in Rome and calls the police. The uniformed officers arrive and find two teenage girls locked in the trunk of a Fiat 127, their bodies brutally maimed and scarred. One of them, 17-year-old Donatella Colasanti, is shaken but alive; the other, 19-year-old Rosaria Lopez, is dead. Two of their attackers have been found and the other, perhaps tipped off, has fled.

The Circeo massacre, as the rape and murder would come to be known, shook Italian society. It was 1975 and the aggressive crime, committed by three young men who attended San Leone Magno, a prestigious all-boys Catholic high school,…