A crooked detective begins investigating a situation on behalf of a friend and gets involved in murder, deception and double-cross.
Unfortunately the movie Detective Belli is not yet available on HBO Max.
| Directing | Romolo Guerrieri | Director |
| Editing | Marcello Malvestito | Editor |
| Production | Mario Cecchi Gori | Producer |
| Sound | Fred Bongusto | Original Music Composer |
| Writing | Ludovico Dentice | Novel |
| Camera | Roberto Gerardi | Director of Photography |
| Art | Giantito Burchiellaro | Production Design |
| Production | Renato Fiè | Unit Manager |
| Production | Bruno Altissimi | Administration |
| Writing | Franco Verucci | Screenplay |
| Directing | Renzo Genta | First Assistant Director |
| Camera | Franco Bruni | Assistant Camera |
| Art | Francesca Saitto | Assistant Production Design |
| Sound | Robby Poitevin | Music Arranger |
| Writing | Alberto Silvestri | Screenplay |
| Editing | Francesco Malvestito | Assistant Editor |
| Costume & Make-Up | Mario Della Torre | Assistant Costume Designer |
| Sound | Guido Ortenzi | Sound |
| Camera | Maurizio Maggi | Assistant Camera |
| Directing | Serena Canevari | Script Supervisor |
| Camera | Gastone Di Giovanni | Camera Operator |
| Production | Camillo Teti | Unit Manager |
| Production | Luciano Luna | Production Manager |
| Production | Antonio Barone | Production Secretary |
| Sound | Mario Morigi | Sound Mixer |
| Writing | Massimo D'Avak | Screenplay |
| Costume & Make-Up | Rosa Luciani | Hairstylist |
| Costume & Make-Up | Franco Corridoni | Makeup Artist |
| Costume & Make-Up | Luca Sabatelli | Costume Design |
