Escaped criminal "The Fox" hates Hoppy and a Rurales colonel for imprisoning him and lures Cassidy to Mexico in order to exact his vengeance in a good Hoppy western brimming with the usual scenic splendour, humour ( A big mama takes a shine to Gabby Hayes) and a menacing villain. There's a good twist regarding there being bad one in the hacienda. That's the Fox's sister. Not a great Hoppy but it's good enough to enjoy.