Mercedes is a very simple girl from Valladolid who marries a plenipotentiary minister. They are in America with the mission to seize some oil concessions. Patricio is forced to seduce the wife of a Chancellor as Mercedes, casually gets more information of the diplomat.
| Directing | Luis César Amadori | Director |
| Writing | Joaquín Calvo Sotelo | Theatre Play |
| Writing | Luis Marquina | Screenplay |
| Writing | Luis César Amadori | Screenplay |
| Camera | José F. Aguayo | Director of Photography |
| Sound | Cristóbal Halfter | Original Music Composer |
| Editing | Antonio Ramírez de Loaysa | Editor |