A famous pianist, invited by a girl, becomes interested in her sister, who pretends to be mute to hide a pronunciation defect.
| Directing | Leopoldo Torres Ríos | Director |
| Directing | Leopoldo Torre Nilsson | Assistant Director |
| Writing | Leopoldo Torres Ríos | Screenplay |
| Writing | Leopoldo Torre Nilsson | Screenplay |
| Writing | Adela Beltrán | Author |
| Crew | Roque Funes | Cinematography |
| Camera | Juan Caraballo | Camera Car |
| Sound | Roberto Locatelli | Music |
| Sound | Alejandro Gutiérrez del Barrio | Music |
| Sound | Ludwig van Beethoven | Original Music Composer |
| Sound | Johann Sebastian Bach | Original Music Composer |
| Sound | Felix Mendelssohn Bartholdy | Original Music Composer |
| Sound | Claude Debussy | Original Music Composer |
| Sound | Modeste Moussorgsky | Original Music Composer |
| Sound | Oscar L. Nourry | Sound |
| Editing | José Cardella | Editor |
| Art | Juan Manuel Concado | Art Direction |