A murdered entomologist, an inscrutable Asian, and a sinister cowboy with rape on his mind are but a few of the many strange characters inhabiting this unusually well-made, Bob Steele Western. Steele plays Larry O'Day, who, along with sidekick Lucky Smith (Don Barclay), comes to the rescue of Barbara Hartnell (Harley Wood), whose entomologist uncle (Frank Ball) has been found murdered at his laboratory near the border to Mexico. If the murder wasn't enough, poor Barbara is in trouble with a strange neighbor, Obed Young (Karl Hackett), who raves about an ancient curse threatening her hacienda. After a mysterious intruder attempts to strangle Lucky, Larry catches German scientist Dr. von Kurtz (John Peters) stealing specimens from the dead entomologist's lab. Barbara, meanwhile, is arrested for the murder by the sheriff (Horace Murphy) but is freed by Jim Barton (Perry Murdock). The latter, a forbidding-looking cowboy, arranges with Chon Lee (Miki Morita) to have Barbara smuggled across the border as a "picture bride," but she is rescued in the nick of time by Larry, who now has proof of who killed Professor Hartnell.