Nach der Rückkehr aus dem Korea-Krieg erschleicht sich ein früherer Leutnant das Vertrauen des Vaters eines gefallenen Kameraden. Skrupellos will er an eine wertvolle Erzmine herankommen. Doch dann wird ihm ein Strich durch die Rechnung gemacht ...

O'Brien is "Whispering" Smith, so named because he speaks softly but knows how to fend for himself. The son of a railroad president, Smith is determined to learn the business from the ground up, so he gets a job as a track walker for his dad's rail line. While going about his duties, he meets Nan Roberts (Irene Ware), who is about to sell her Colorado ranch. Smith finds out that there are valuable tungsten deposits on her land and makes certain she won't be cheated by the villains

A cowboy and a bandit face off over possession of a valuable mine.

During the Second World War, the Allies threaten to attack Spain, an allegedly neutral country, if the Francoist regime keeps allowing Nazi Germany to extract Galician tungsten, a strategic mineral, paramount to the war effort.