Raphael, a restaurant mandolin player with a limp, a father to support, and a lot of debt, accepts a job offered by his friend, Giardino, to play a serenade under an apartment window at the behest of a mysterious blonde. As he’s playing, a man high up on a balcony is pushed to his death. Raffaele is compelled to conduct his own investigation and becomes embroiled in a mystery involving a macabre secret...
| Directing | Sergio Corbucci | Director |
| Writing | Giuseppe Catalano | Screenplay |
| Writing | Sabatino Ciuffini | Screenplay |
| Writing | Sabatino Ciuffini | Story |
| Production | Achille Manzotti | Producer |
| Production | Paolo Infascelli | Associate Producer |
| Sound | Riz Ortolani | Original Music Composer |
| Camera | Luigi Kuveiller | Director of Photography |
| Editing | Amedeo Salfa | Editor |
| Art | Marco Dentici | Art Direction |
| Art | Mauro Passi | Set Decoration |
| Costume & Make-Up | Wayne A. Finkelman | Costume Design |
| Directing | Amanzio Todini | Assistant Director |
