Doctor Miguel Azzini is found shot dead dead. The police suspect his colleagues: Elena Carli, his former mistress and owner of the clinic where he worked; Roberto Carli, her surgeon husband; Doctor Paula Lombardo, Roberto's mistress; and the clinic's administrator. Inspector Nardi discovers that Elena has a heart condition and had offered Miguel an increased sharehold in the clinic in order to dissuade him from leaving for another post. Elena's heart condition is worsened by the relentless police scrutiny and by her suspicion that Roberto is the murderer. She has to be rushed into hospital and is even more alarmed when Roberto prepares to operate...
| Directing | Tulio Demicheli | Director |
| Writing | Pedro Mario Herrero | Story |
| Writing | Pedro Mario Herrero | Screenplay |
| Writing | Mario Di Nardo | Screenplay |
| Production | José Gutiérrez Maesso | Producer |
| Sound | Franco Micalizzi | Original Music Composer |
| Editing | Ángel Serrano | Editor |
| Art | Francisco Canet | Art Direction |
| Art | Gastone Carsetti | Art Direction |
| Production | Carlo Giovagnorio | Unit Manager |
| Production | Faustino Ocaña | Production Manager |
| Art | Rafael Borqué | Assistant Set Decoration |
| Art | Juan Gracia | Property Master |
| Camera | Oddone Bernardini | Assistant Camera |
| Camera | José Cobos | Assistant Camera |
| Camera | Angelo Lannutti | Camera Operator |
| Camera | Aldo Marchiori | Assistant Camera |
| Camera | Teodoro Roa | Camera Operator |
| Camera | José Salvador | Still Photographer |
| Costume & Make-Up | Franco Antonelli | Wardrobe Supervisor |
| Costume & Make-Up | Osanna Guardini | Wardrobe Assistant |
| Directing | Olga Moller | Continuity |
| Production | Ángel M. Ocaña | Production Assistant |
| Production | Antonio González | Production Assistant |
| Crew | Martínez Bordiú | Technical Advisor |
| Camera | Manuel Rojas | Director of Photography |
