Silvia Heredia, since her arrival to Madrid is staying at her best friends' house, Mary. Her aim is to work as a secretary of a famous novelist. But at night the house is full of people and they confuse her with the owner of the floor. A series of misunderstandings makes her meet Ricardo Ariaga, the musician whose opera "Life begins at midnight" is about to debut. Ricardo convinces Sylvia to act as his wife. With a "rented" child they try to be the perfect family of a lonely old man.
| Directing | Juan de Orduña | Director |
| Writing | Juan de Orduña | Writer |
| Writing | Luisa Maria Linares | Novel |
| Writing | Antonio Mas Guindal | Adaptation |
| Sound | Juan Quintero | Music |
| Camera | Willy Goldberger | Director of Photography |
| Editing | Juan J. Doria | Editor |
| Art | Enrique Alarcón | Set Decoration |
| Costume & Make-Up | Elisa Aspachs | Hairstylist |
| Costume & Make-Up | Antonio Turell | Makeup Artist |
| Production | Joaquín Cuquerella | Production Manager |
| Directing | Francisco Rovira Beleta | Assistant Director |
| Directing | Miguel Tudela | Assistant Director |
| Sound | Jaime Torrens | Sound Engineer |
| Art | Fernando Navarro | Property Master |
| Art | Enrique Rivas | Property Master |
| Camera | Tomás Duch | Assistant Camera |
| Camera | César Fraile | Assistant Camera |
| Camera | Julio Ortas | Still Photographer |
| Costume & Make-Up | Pedro Rodríguez | Wardrobe Master |
| Directing | Carmen Salas | Script Supervisor |
| Production | Tomás de la Plaza Alonso | Production Secretary |