Idaho Kent, an agent of the pony express company, is asked to reach Sacramento with proof against a dishonest politician candidate for the local elections. Several people, paid by the corrupt man, try to stop him.

Andrea Zaccardi has returned home from hunting. He and his wife Luisa are very close. Their young son Giulio develops a cough. The doctor recommends the seaside. Luisa leaves with Giulio for several weeks. Andrea stays to work at the metal shop.

Train operator Andrea Marcocci has to witness the suicide of a desperate man who jumps in front of his train. Under the influence of this shock he starts making mistakes. A check up by a doctor reveals that he's at the brink of becoming an alcoholic. Due to this evaluation he is degraded and must accept a salary cut.