When Chiara, a violinist at the conservatory, is brutally murdered after a performance, inspector Maccari is put on the case. Maccari, whose own wife was once murdered by a serial killer, suspect professor Baraldi, the director of the conservatory. But as more fall prey to the killer, Maccari comes to a shocking conclusion...
| Directing | Sergio Martino | Director |
| Writing | Sergio Martino | Screenplay |
| Writing | Francesco Contaldo | Writer |
| Sound | Luigi Ceccarelli | Original Music Composer |
| Camera | Bruno Cascio | Director of Photography |
| Editing | Eugenio Alabiso | Editor |
| Editing | Giovanni Ballantini | Editor |
| Costume & Make-Up | Stefania Svizzeretto | Costume Design |
