Your Vice Is a Locked Room and Only I Have the Key

A washed-up, alcoholic writer who lives in Teolo's old villa. He brutalizes his wife Irina and their maid Brenda while hosting debauched parties for local hippies. He guards his late mother's dress and the cat Satan, using their relics to bolster control and paranoia.

Oliviero's wife who lives in fear of her husband. She appears compliant yet secretly schemes with a lover and uses manipulation to survive. Her alliance with Walter and her role in Oliviero's downfall reveal a calculating, dangerous complexity.

Oliviero's niece who teases her uncle and pursues Dario. She becomes entangled in the family drama, later aiding in hiding Oliviero's body and navigating the dangerous web of desire and secrecy.

Oliviero's maid who is drawn into the villa's dangerous atmosphere. She dons Esther's dress and falls victim to the violence that festers in the house, becoming a pawn in the couple's deadly games.

A motorbike racer who flirts with Floriana and pursues a lucrative contract before becoming a casualty of Walter's machinations. His affair and ambitions push him toward a fatal end.

The gray-haired man who is Irina's secret lover and accomplice. He manipulates events, helps mask Oliviero's crimes, and ultimately meets his end when Irina pushes him off a cliff.

The inspector who questions Oliviero after Fausta's murder and leads the investigation. He embodies persistent inquiry as the truth slowly unfolds.

Bordello owner who provides a witness point in the tale; she reports Irina's maiming of Satan and anchors the local witness network around the villa.

Oliviero's mistress whose murder triggers the investigation. Her death exposes the fragile truth behind Oliviero's alibi and opens the path to the villa's dark secrets.