A fast-shooting woman marshal interferes with the efforts of Hopalong Cassidy and his sidekick Red Connors to track down the bandits who stole a shipment of Army rifles.
Hoppy and Red hide an innocent young Mexican from a lynch mob and then go after the murderer who framed the boy.
Hoppy tries to help an ex-convict, hoping to go straight, who is being blackmailed into joining a plot to rob the Cattlemen's Association.
Hoppy and Red combat a rancher and a crooked lawyer who are trying to drive immigrant settlers off their land.
Hoppy saves an innocent man from hanging and tracks down a murderer who's manipulating the feud between two rival ranchers.
Hoppy tries to prove that a traveling preacher is behind a series of robberies by three men who have a habit of vanishing into thin air.
Hoppy uses an incriminating letter and a crooked card deck to hunt down the murderers of a small boy's parents.
Hoppy's efforts to save a young woman's mine from swindlers are complicated when Red Connors develops amnesia and claims to be a Spanish nobleman.
Hoppy uses an intricately carved bracelet to trap some swindlers who are trying to cheat the Indians out of their oil-rich reservation lands.
A blind Mexican woman asks Hoppy to help her fugitive son, who's been falsely accused of murder.
When Red Connors buys some arid land on the strength of a promised irrigation project, Hoppy investigates and learns that the promoters of the scheme are guilty of forgery, embezzlement and murder.
Hoppy helps government agents search for a herd of 625 stolen horses intended for the Spanish-American War, but when he finds the animals, he has to save them from a grass fire.
Hoppy and Red try to settle a dispute between cattle ranchers and sheep grazers.
Hoppy helps a young man and woman who are framed as counterfeiters just before they are to claim their uncle's estate.
