It opens with a prostitute (Wanda Rocci) found brutally murdered in a park along the banks of the Tiber River in Rome. The police bring in a number of suspects identified as being in the park at the time of the evening murder and question them individually. Through flashback we learn a lot about the screwed up lives of the suspects, all pretty rotten individuals and born liars. The investigation eventually brings forth an eyewitness, a homosexual (Silvio Laurenzi) ripped off by the teenage suspects, who identifies the suspected killer. When nabbed all the man from the north could utter was that “She was a whore!” The suspects include an unsympathetic country bumpkin youngster (Francesco Ruiu) ineptly trying to steal from distracted lovers in the park, a 30-year-old ex-con now a reformed thief but a pimp (Alfredo Leggi) who rebels at being dominated by his overbearing prostitute girlfriend (Gabriella Giorgelli), a simple-minded soldier (Allen Midgette) from the south with nothing to do on leave but harass women in the street and sleep on the park bench, a creepy looking man in clogs (Renato Troiani) running past the sleeping soldier with something concealed under his coat, and a couple of confused teens (Alvaro D’Ercole & Romano Labate) looking for easy money to buy food for their dates.