Das Gesetz der Prärie

Hoppy (William Boyd) and his pal Lucky (Russell Hayden) head to South America to look after a herd of cattle sold by Cassidy's boss to an Argentine rancher. Villain Ralph Merritt (Sidney Blackmer) wants to get his mitts on that cattle, and he's not above hiring the scum of the earth to do his bidding. Fortunately, Hoppy, Lucky and their new Latin American buddy Don Fernando (Sidney Toler) make short work of the bad guys in an outsized barroom brawl.

There's a change of scenery in this Hopalong western - Hoppy and co. Vamoose to South America, become gauchos, delivering cattle there, but needless to say, they end up knee deep in trouble - there's more intrigue and mystery in this one as Hoppy realises that the deaths of the son and daughter of Valdez, Argentinian rancher, wasn't a mere accident. He suspects the rancher's son in law ... it's a well-plotted and solid western with grand scenery and engaging story. A strong entry.