THE KILLER MUST KILL AGAIN

A serial rapist and killer of women across Italy is seen sinking the latest woman he murdered into a river by Giorgio Mainardi. Giorgio married his wife Norma for money and has numerous affairs, making for an unhappy marriage. When he takes the killer's lighter, which has his initials, he says he won't turn the killer into the police if he murders Norma on Giorgio's behalf. The killer eventually does so, but a young couple, Luca and Laura, steals the killer's car with Norma's body in the trunk. They wanted the car for the chance to go to the beach, and because of the carjacking, the killer takes his own car to find them. Giorgio, meanwhile, pretends to be in grief from Norma's disappearance, but the police immediately suspect him.

When the couple arrive at a rundown villa, Luca leaves Laura to get some supplies. He picks up a stranded blond woman on the side of the road when she has car troubles. Back at the villa, the killer finds Laura alone, and furious at her and Luca carjacking him, he rapes her, coinciding with Luca making out with the blond woman in the back of his car. When Luca and the woman return to the villa, the killer knocks Luca out and stabs the blonde woman dead. As he prepares to kill the couple, Laura breaks free from her ties and stabs the killer to death. The police thank the couple for stopping him, as they'd been searching for him for months. To catch Giorgio, they leave the car with Norma's body in front of his house. When Giorgio is caught trying to sink Norma and the car, he's arrested.

Laura frees herself and kills the serial killer as he attempts to murder her and Luca. The police thank the couple and set a trap for Giorgio, who is arrested while trying to dispose of Norma’s body.

The ending ties off each narrative strand: the killer’s spree is ended not by the authorities but by a survivor fighting back, subverting the victim trope. Giorgio’s attempt at the perfect crime collapses under police scrutiny and his own greed, reinforcing the film’s cynical take on morality and justice. The police use his own scheme against him, a final ironic twist in this labyrinth of betrayal.