It's nonstop action in this early western, with Jones south of the border as a Mexican Army captain. His prey is McCullough and Maris, a pair who have been stirring up quite a bit of trouble. Fix, as Jones' weaker brother, reprises his role from the earlier THE AVENGER (1931). SOUTH OF THE
RIO GRANDE incorporates footage from another Jones' western, MEN WITHOUT LAW (1930).