Capt. Eugenio arrives in a remote castle to take charge of a unit guarding a nameless prisoner. No one knows much about the inmate as he is held in a forlorn tower. When the captain's wife Adele tries to shake her melancholia by playing the piano, she finds -- much to her surprise -- that she's being accompanied by violin music coming from the prison cell.
| Directing | Roberto Petrocchi | Director |
| Writing | Roberto Petrocchi | Screenplay |
| Writing | Riccardo De Luca | Screenplay |
| Production | Manolo Bolognini | Producer |
| Camera | Camillo Bazzoni | Director of Photography |
| Editing | Paolo Benassi | Editor |
| Sound | Andrea Morricone | Music |
| Costume & Make-Up | Maria Luisa Di Giovanni | Costume Design |
| Costume & Make-Up | Germano Natali | Makeup & Hair |
