Historically important, and prophetically titled, 'Riders of Destiny' is the first of a dozen or so B-westerns made by John Wayne which set him firmly on a course to stardom. Wayne plays "Singin' Sandy", a government agent sent to hunt villains, singing as he heroically guns them down. Bad guy Kincade controls the area's water supply and is about to force the ranchers into contracts at exorbitant rates. Government Agent Saunders has a plan that will open up the lost river and dry up Kincade's supply. So he gets the ranchers to insist on a clause that Kincade's land will revert to the public if he fails to deliver water.