Sandro, a detective, finds his wife strangled. His girl-friend Tiffany, who works as photographer, makes a "Blow up" from a photo, what Sandro finds beside the victim.
A film demonstrating steps to take in the event of a nuclear attack. Animated drawings show the effects of atomic explosions in the air and at ground level.
In 1913, in Oklahoma, oil derrick owner Lena Doyle, aided by her father and a hobo, is stubbornly drilling for oil despite the pressure from major oil companies to sell her land.
In this film the director's recurring concerns return: the divisions in the Chilean left, and its contradictions between what the director calls the "traditional" and the "revolutionary" left.