U.S. Treasury agent, Jack Wood, is trying to find the source of counterfeit money appearing in Texas border towns when he suddenly disappears in El Paso. The deputy treasury director informs a select group of President Ulysses S. Grant's advisors of Wood's disappearance and of Mexico's possible involvement with the counterfeit money. With instructions from Washington, six Texas Rangers arrive in El Paso, only to learn that Wood is being held captive in Mexico and the Mexican government is nearing revolution. In steps Wood's best friend, Ellsworth T. Kincaid, to plan a raid into Mexico and rescue his friend.