Border patrol: Hopalong and pals discover how 25 Mexicans disappeared after being hired by the Silver Bullets mine. Doomed caravan: Jane Travers (Minna Gombell), who runs Crescent City Freighting Co., fights a gang of robbers with Hopalong's help. Fool's gold: Colonel Jed Landy (Forbes Murray) visits the Bar 20 to ask Hopalong to help save his son. Forty thieves: Hopalong proves his opponent for the sheriff's race is crooked. Hidden gold: Hopalong and Lucky visit their old pal Speedy (Britt Wood) and investigate gold thefts.