This is a Trail Blazer film from Monogram which stars Ken Maynard, Hoot Gibson and Bob Steele. Series film like this that featured trios of do-gooders were pretty common in the day--with the Three Mesquiteers and the Rough Riders spurring on the creation of the Trail Blazers (the latest and shortest running of the three). I think the idea was to take several second-tier stars and combine them for greater drawing power. So, an older and less charismatic Gibson could gain renewed box office draw in such an endeavor (Gibson was big in the silents and early talkies). In every one of these films, the trio is like a group of social workers/gunslingers who seldom shoot and mostly reveal who the ACTUAL leader of the evil mob besieging the townsfolk really is. It's all very predictable and after a while there is a definite sameness to the films.
In this case, a town is having problems with gold shipments being stolen. So, they hire the trio to get to the bottom of it. Of course, it will mean some of them going undercover (in this case, Bob) and it's exactly the same plot I've seen in BOTH Three Mesquiteer AND Rough Rider films! It's even been used in Gene Autry and Roy Rogers films, now that I think about it. However, what IS different is why the shipments are stolen--and it's NOT what you expect. This twist helps, but otherwise it's yet another of the same. And, unless you are the type person to want to see EVERY B-western, it's easy to skip this one as it really isn't outstanding in any way.