Someone's stealing gold shipments in Colorado. John Whyte, ace Pinkerton detective, is tasked to find the culprits and bring them to justice. He is joined by his friends and associates: Khan Singh, his loyal Sikh manservant from his service for the Queen in India, who followed him to America and fought at his side in the Civil War; and Curly Bill Williams, his American friend from Texas. John investigates the string of brutal robberies of gold shipments...