A sadistic count tortures and murders his unfaithful wife and her lover, then removes their hearts from their bodies. Years later, the count remarries and the new wife experiences nightmares and hauntings.
Unfortunately the movie Nightmare Castle is not yet available on HBO Max.
| Directing | Mario Caiano | Director |
| Sound | Ennio Morricone | Original Music Composer |
| Editing | Renato Cinquini | Editor |
| Production | Carlo Caiano | Producer |
| Camera | Enzo Barboni | Director of Photography |
| Production | Massimo Tavazzi | Production Designer |
| Sound | Bernardino Fronzetti | Sound Engineer |
| Sound | Ennio Morricone | Conductor |
| Directing | Priscilla Contardi | Continuity |
| Costume & Make-Up | Duilio Giustini | Makeup Artist |
| Camera | Mario Mancini | Camera Operator |
| Writing | Mario Caiano | Story |
| Costume & Make-Up | Mario Giorsi | Costume Designer |
| Directing | Angelo Sangermano | Assistant Director |
| Writing | Fabio De Agostini | Story |
| Camera | Ermanno Serto | Still Photographer |
| Production | Pietro Nofri | Production Assistant |
| Art | Massimo Tavazzi | Set Decoration |
| Production | Carlo Caiano | Production Manager |
| Writing | Fabio De Agostini | Screenplay |
| Production | Pietro Nofri | Supervising Producer |
| Writing | Mario Caiano | Screenplay |
| Writing | Mario Caiano | Dialogue |
| Writing | Fabio De Agostini | Dialogue |
