Antonio Mea

A small town in Italy is about to celebrate their patron saint. The city is full of people with different problems. A Communist in existentialist crisis that also must take care of his mentally ill wife. A woman who is tired of her husband's inability to show emotions and therefore more and more often slips into the world of dreams. A perverse butcher engaged in sex with the meat he sells when he's not peeping on young girls. A girl who became pregnant after having sex with her father. In this town a mysterious stranger show up and who turns on several of the inhabitants lives.

Just out of prison, ex-con Ugo Piazza meets his former employer, a psychopathic gangster Rocco who enjoys sick violence and torture. Both the gangsters and the police believe Ugo has hidden $300,000 that should have gone to an American drug syndicate boss. Caliber 9 is the first part in Di Leo's "Milieu" Trilogy of poliziotteschi films. It was followed by "The Italian Connection" (1972) and "The Boss" (1973).