The ranch of Red Ryder and his aunt, The Duchess, is being used as the training site for "Gentleman Jim" Corbett for his upcoming fight in Carson City, Nevada for the heavyweight championship against Bob Fitzsimmons.
One of the earliest surviving motion pictures is that of the Corbett-Fitzsimmons heavyweight championship bout held in Carson City, Nevada in 1897. That historic event is the backdrop of this film Vigilantes Of Boomtown where some crooks are planning to steal the gate proceeds from the fight.
Boxing at the time was illegal in many places, but not for the most part in the rough and tumble west. Why Peggy Stewart is so adamantly opposed to the fight is beyond me. But that's part of the plot.
The Corbett camp is using the Duchess's ranch as their training camp so Red Ryder and Little Beaver get into the plot that way. There's also perennial western villain at Republic Studios Roy Barcroft who has some history with Red Ryder and is hoping to meet up with him and settle accounts at the same time he pulls off the caper of the gate.
Roscoe Karns has a really nice role as Billy Delaney, Corbett's legendary manager who Stewart's dog takes a real 'liking' to.
Still Vigilantes Of Boomtown is a subpar entree in the Red Ryder series.