Andrés' parents, in Madrid, and Pierre's parents, in Paris, have agreed to a school exchange for their children during the summer. However, when they go to the station to pick up Pierre, 10 years old, they meet an attractive young woman who takes his place. The presence of Ivette is a shock to the family, especially for the older son, who is strongly attracted to the French.
| Directing | José María Forqué | Director |
| Writing | Vicente Coello | Screenplay |
| Writing | Pedro Masó | Screenplay |
| Production | Pedro Masó | Producer |
| Sound | Adolfo Waitzman | Music |
| Camera | Juan Mariné | Director of Photography |
| Editing | Pedro del Rey | Editor |
| Editing | Claude Plouganou | Editor |
| Art | Antonio Simont | Set Decoration |