A French National Treasury van is assaulted and they steal the gold bullion it was carrying. According to confidences received by the Police Headquarters of Barcelona, it seems that part of the gold is clandestinely introduced into Spain through the Pyrenees. In order to discover and eradicate such smuggling infiltration, an agent pretends to be a day laborer at a farm located on the border and in a suspicious area.
| Actor | Role |
|---|---|
 Claudine DupuisIsabelle | Isabelle |
 Danielle GodetAurora | Aurora |
 Frank LatimoreJavier | Javier |
 Estanis GonzálezJosé | José |
 Adriano RimoldiDon Rafael | Don Rafael |
 Julio RiscalJornalero burlón | Jornalero burlón |
 Miguel LigeroAbuelo | Abuelo |
 Gérard TichyJulio | Julio |
 Juan de LandaFélix | Félix |
 Armando MorenoRoca 'José Sancho' | Roca 'José Sancho' |
| YYva BellaNot listed | Not listed |
| MManuel CanoVoz del telegrafista (uncredited) | Voz del telegrafista (uncredited) |