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.
| Actor | Role |
|---|---|
 Olga ZubarryLila Espinoza | Lila Espinoza |
 Guillermo BattagliaBoris Andreieff | Boris Andreieff |
 Eduardo CuitiñoLima | Lima |
 Nicolás FreguesDoctor Robledo | Doctor Robledo |
| PPablo AcciardiMerlín | Merlín |
 Margarita CoronaValeria Duval | Valeria Duval |
 Amalia Sánchez AriñoSra. Vargas | Sra. Vargas |
 Horacio PetersonLucho Rivas | Lucho Rivas |
 Carlos PerelliNorton | Norton |
 Agustín OrrequiaCamelio Vargas | Camelio Vargas |
| ÁÁngel BoffaBarquinazo | Barquinazo |
 Juan CoronaLamas | Lamas |
 Orestes SorianiDoctor Kaplan | Doctor Kaplan |
| AAlfredo AlariaJoven en la prueba de magia (uncredited) | Joven en la prueba de magia (uncredited) |
 Alberto BarcelPolicía (uncredited) | Policía (uncredited) |
 Ramón J. GarayConserje | Conserje |
 Roberto EscaladaRelator | Relator |