Gridley is mining silver from an old Mexican mine and bringing it into the USA thru a passage into his worthless mine. Border guard Rogers suspects Gridley and finally finds the secret entrance to the Mexican mine. He sends Lee Madison for help only to have her captured by Gridley. Trigger brings help that takes care of Gridley's men and now Roy has to rescue Madison.

• Republic Pictures
• Roy Rogers
• Trigger
• Dale Evans
• Andy Devine
• John McGuire
• Olaf Hytten
• David Sharpe
• Fritz Leiber