Captain Bob Dayton and Lieutenant Ed Carey are partners in a company called "Sky Raiders" which seeks US government contracts for its inventions. Enemy spies attempt to steal, sabotage and discredit the inventions and founders of the company.
Filmed in the Sierra Nevada mountains near Sonora, California, this Universal serial is Universal's 40th sound-era serial. Eagle Scout Bruce Scott, leader of Martinsville Troop Number One, and his pack sets off in search of lost treasure and finds adventure
A bandit disguises himself as an officer in an attempt to woo a saloon singer.
Sheriff Bill Jones, in the line of duty, kills outlaw Joe Land and adopts his young son, Tim. They come upon a former silver boomtown, reputed to be haunted, whose only inhabitant is Hiram McDuff, a friend of Bill's. Ranch owner Joan Stanley hires Bill and Tim. Her father has been killed by the gang of Wolf Larson. By mistake, McDuff hires the Larson gang on as ranch hands for Joan. They plan to steal the stock while Bill is away. Tim overhears the plot and informs Bill. Bill and Tim use ghost makeup, skeleton sheets (even outfitting their horses with skeleton-looking blankets) and tricks to rout the superstitious gang members...
Henry Jethrow is after the Wilson ranch. He has George Wilson unknowningly sign a note for the ranch, has him killed, and then presents the note. The Pinto Kid, investigating cattle rustlers, accidentally drops his glove at the murder scene and now has a price on his head. He has Beth Wilson turn him and use the reward money to reclaim the note. Now he has to escape jail and find the real killers.