After indulging in an affair with a man (a friend of the family) she truly loves, a woman returns to her young son and husband for good, and loses contact with the man. Her husband is unaware of the affair. Twenty years later, there is news that the friend has died and left all of his money to the younger son in the family, which leads us to question this younger son's biological origin.
| Directing | Luis Buñuel | Director |
| Writing | Guy de Maupassant | Novel |
| Writing | Jaime Salvador | Adaptation |
| Writing | Jaime Salvador | Dialogue |
| Crew | Rodolfo Usigli | Additional Dialogue |
| Writing | Luis Buñuel | Screenplay |
| Directing | Mario Llorca | Assistant Director |
| Sound | Antonio Bustos | Sound Editor |
| Production | Sergio Kogan | Producer |
| Sound | Raúl Lavista | Original Music Composer |
| Camera | Raúl Martínez Solares | Director of Photography |
| Editing | Jorge Busto | Editor |
| Art | Gunther Gerszo | Production Design |
| Production | J. Luis Busto | Unit Production Manager |
| Sound | Rodolfo Benítez | Sound Recordist |
| Sound | Rafael Ruiz Esparza | Sound Re-Recording Mixer |
| Lighting | Carlos Nájera | Gaffer |
| Camera | Cirilo Rodríguez | Camera Operator |
