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.

Cast

Conrado San Martín

Elena Espejo

Tomás Blanco

Manuel de Juan

Luis Pérez de León

Carlos Muñoz Arosa