A murderer terrorizes the city of Buenos Aires by attacking on the streets on rainy days and always leaving a card with the name "S. López". A local boarding house full of eccentrics appears to house a possible suspect.
| Directing | Carlos Hugo Christensen | Director |
| Writing | Stanislas-André Steeman | Novel |
| Writing | Carlos Hugo Christensen | Writer |
| Writing | César Tiempo | Writer |
| Sound | George Andreani | Original Music Composer |
| Camera | Alfredo Traverso | Director of Photography |
| Editing | Martín Morazzo | Editor |
| Editing | Antonio Rampoldi | Editor |
| Editing | Sebastian C. Perilio | Editor |
| Art | Jean de Bravura | Art Direction |
| Art | Francisco Guglielmino | Set Decoration |
| Directing | José Arturo Pimentel | Assistant Director |