Four notorious bank robbers meet up in an isolated castle to divide a large number of diamonds hidden there by their former, deceased boss whose Italian wife is hosting a party.
Unfortunately the movie A Hyena in the Safe is not yet available on HBO Max.
| Editing | Enzo Monachesi | Editor |
| Writing | Alberto Penna | Writer |
| Writing | Cesare Canevari | Writer |
| Directing | Cesare Canevari | Director |
| Sound | Gian Piero Reverberi | Original Music Composer |
| Crew | Claudio Catozzo | Cinematography |
| Art | Mario Solá | Art Direction |
