A woman is found murdered in her house the day after a party. The police begins the search for the killer asking questions to all the people that attended the party.
| Directing | Ramón Fernández | Director |
| Writing | Ramón Fernández | Writer |
| Writing | José María Palacio | Writer |
| Writing | Enrique Urrutia | Writer |
| Sound | Adolfo Waitzman | Music |
| Camera | Godofredo Pacheco | Director of Photography |
| Production | Enrique Urrutia | Executive Producer |
| Editing | José Antonio Rojo | Editor |
| Art | Sigfrido Burman | Production Design |
| Costume & Make-Up | Ángel F. Martínez | Makeup Artist |
| Production | Joaquín Domínguez | Production Manager |
| Art | Francisco Rodríguez Asensio | Construction Coordinator |
| Camera | Jesús Jiménez | Assistant Camera |
| Camera | Saturnino Pita | Assistant Camera |
| Camera | Luis Sanz | Still Photographer |
| Editing | Concepción Piño | Assistant Editor |
| Production | Enrique Jiménez Pereira | Production Assistant |
| Directing | José María Palacio | Script Supervisor |
| Sound | Felipe Fernández | Sound Engineer |