When dynamite-wielding mystery men repeatedly sabotage the construction of a new reservoir and kill the "ditch rider" responsible for the site's security, cowboy Gene Autry is hired to replace him and bring the saboteurs to justice.
A typically entertaining Republic Pictures production, this has some good action and stunt work, with the always likable Smiley Burnette backing up Gene and offering some comic relief to the proceedings.
One interesting sequence (that should have been longer) involves Autry tracking the villains to an abandoned territorial prison in the middle of the desert.
Keen viewers will recognize future Producers' Releasing Corporation contract villain Charles King, who figures prominently in the film's climactic riot!
Musical interludes are few this time around, though Gene does get to sing his big hit version of the title song.