A Spanish music hall performer gets caught up in espionage during the First World War.
| Directing | Rafael Gil | Director |
| Writing | Antonio Mas Guindal | Screenplay |
| Writing | Jesús María de Arozamena | Screenplay |
| Writing | José Zamora | Story |
| Production | Marciano De la Fuente Rodríguez | Producer |
| Sound | Gregorio García Segura | Music |
| Camera | Mario Montuori | Director of Photography |
| Editing | Julio Peña | Editor |
| Art | Enrique Alarcón | Art Direction |
| Costume & Make-Up | Martín Zerolo | Costume Design |
| Costume & Make-Up | Rodrigo Gurrucharri | Makeup Artist |
| Sound | Antonio Alonso | Sound |
