Post Office Box 1001

Barcelona, Spain. A young man is murdered in the middle of the street in front of the police headquarters. Miguel and Marcial, two agents of the Criminal Brigade in charge of the investigation, find in the victim's room a newspaper where a cryptic classified ad appears.

Director: Julio Salvador

Cast

Conrado San Martín

Miguel

Elena Espejo

Carmen

Tomás Blanco

Antonio

Manuel de Juan

Marcial

Luis Pérez de León

Don Rafael

Carlos Muñoz Arosa

Rafael

Guillermo Marín

Eyewitness

Casimiro Hurtado

Pascual el Mirada