In a run-down South American town, four men are paid to drive trucks loaded with nitroglycerin into the jungle through to the oil field. Friendships are tested and rivalries develop as they embark upon the perilous journey.
Saverio Luparello is the manager of Sicilian baron Occipinti's estate. The cunning greedy man intentionally lets the land turn into a wasteland, hoping that his employer, discouraged by its low returns, will sell his earth to him for next to nothing. His plans are thwarted by a share cropper, Diego Costa, who farms his lot zealously and to good results.
The noble Pantaleo Di Santa Paola has just died, and the preamble to his will is a confession in which he claims that in his youth he had a relationship with a circus rider that produced twin sons.
