Purif is distraught when her lover is betrothed to another. When she summons the old ways to curse him, her erratic behavior is interpreted as demonic possession, and the villagers turn against her with physical and sexual violence.
Unfortunately the movie The Demon is not yet available on HBO Max.
| Writing | Luciano Martino | Screenplay |
| Writing | Brunello Rondi | Screenplay |
| Writing | Ugo Guerra | Screenplay |
| Directing | Giovanfrancesco Fantacci | Script Supervisor |
| Directing | Brunello Rondi | Director |
| Writing | Brunello Rondi | Story |
| Production | Libero Balduini | Unit Manager |
| Production | Elio Scardamaglia | Line Producer |
| Camera | Carlo Bellero | Director of Photography |
| Production | Paolo Giovanardi | Production Manager |
| Sound | Piero Piccioni | Original Music Composer |
| Production | Federico Magnaghi | Producer |
| Directing | Renata Paulucci | Second Assistant Director |
| Editing | Mario Serandrei | Editor |
| Production | Ugo Guerra | Producer |
| Production | Luciano Martino | Producer |
| Directing | Sergio Martino | Second Assistant Director |
| Costume & Make-Up | Anna Maria Palleri | Costume Design |
| Costume & Make-Up | Franco Freda | Makeup Artist |
| Art | Andrea Fantacci | Set Decoration |
| Camera | G.B. Poletto | Still Photographer |
| Directing | Paolo Bianchini | First Assistant Director |
| Camera | Gaetano Valle | Camera Operator |
| Camera | Guglielmo Vincioni | Assistant Camera |
| Editing | Tommasina Desideri | Assistant Editor |
