When a worker is found murdered on the construction side, the investigation swiftly turns from things criminal to the political circumstances surrounding the building itself. Widespread corruption and neglect by the builder himself are seen to have brought the situation about. Much of the movie is filmed using hand-held cameras, and the majority of the dialogue is in the difficult-to-understand and very slangy Spanish dialect of Mexico City's bricklayers.
Don Jesus

Patotas

Perez Gomez

Federico

Chapo Álvarez

Josefina

Jacinto Martínez

Ing. Zamora

Munguia
Sergio García

Marcial

Delegado
Dávila, policía

Valverde, policía

Madre de Isidro

Rosa

Suárez, policía

Sacerdote
Baltazar
Choforo
Darío
Policía
Cojo
Amigo de Federico (uncredited)

Amigo de Federico (uncredited)

Amigo de Federico (uncredited)
Lencha, amiga de Chapo (uncredited)
Secretaria (uncredited)