A police inspector instructs his men on how to behave by explaining the development of two criminal cases.
| Actor | Role |
|---|---|
| PPepy DomingoMargot | Margot |
 Luis InduniAnselmo | Anselmo |
 Conrado San MartínInspector jefe Nogués | Inspector jefe Nogués |
 Josep Maria AngelatInspector Blasco | Inspector Blasco |
 Jaime AvellánInspector Antonio Rius | Inspector Antonio Rius |
 Jesús ColomerRicardo Pérez | Ricardo Pérez |
 María Victoria DuráMadame Pérez | Madame Pérez |
 Emilio FábregasComisario | Comisario |
| JJaime BellaubiNot listed | Not listed |
| RRafael ResinesNot listed | Not listed |
| JJuan PiñolNot listed | Not listed |
| AAlberto VialisComisario Ramos | Comisario Ramos |
| LLuis de SalazarNot listed | Not listed |
| MManuel SoléNot listed | Not listed |
| JJaime MasaguetNot listed | Not listed |
 José MarcoHerbert Gast | Herbert Gast |
| GGloria GarcíaTurista | Turista |
| MMireille OzySúbdita norteamerica (no acreditado) | Súbdita norteamerica (no acreditado) |
| MManuel BronchudPolicía del tren (no acreditado) | Policía del tren (no acreditado) |