In the crypt of the remote castle of the Aguilars lies the recently-deceased body of Maria. Her husband Antonio is a jealous bully, his mute brother Ignazio is in a wheelchair peeping on his caretaker Sol, a novice. Also present are Miria, the couple's virginal daughter, and Isidro, a factotum who fears Satan's power. A frequent visitor is Juan Suarez, a doctor who wants Miria in a sanatorium for a month. She doesn't want to go. Isidro tries to exorcize the castle's evil spirits. Bodies pile up. Is Miria's mother truly dead, and who is Satan's tool?
| Directing | Mario Bianchi | Director |
| Editing | Cesare Bianchini | Editor |
| Sound | Nico Catanese | Original Music Composer |
| Production | Salvatore Siciliano | Production Designer |
| Production | Gabriele Crisanti | Producer |
| Writing | Gabriele Crisanti | Story |
| Writing | Piero Regnoli | Screenplay |
| Writing | Gabriele Crisanti | Screenplay |
| Costume & Make-Up | Itala Giardina | Costume Designer |
| Directing | Spartaco Antonucci | Assistant Director |
| Camera | Francesco Campanile | Camera Operator |
| Production | Giancarlo Straniero | Production Secretary |
| Production | Gabriele Crisanti | Production Manager |
| Costume & Make-Up | Rosario Prestopino | Makeup Artist |
| Production | Mirella Cavalloro | Production Secretary |
| Directing | Paola Villa | Script Supervisor |
| Sound | Silvio Spingi | Sound |
| Production | Gianfranco Fornari | Production Secretary |
| Production | Marcello Spingi | Unit Production Manager |
| Camera | Maurizio Fiorentini | Assistant Camera |
| Editing | Gabriella Marsetti | Assistant Editor |
| Camera | Angelo Lannutti | Director of Photography |
| Camera | Franco Villa | Director of Photography |