The sheriff is in love with a beautiful widow. The widow has a brother who is in secret a rascal and a member of a gang of bandits. The sheriff and the widow have arrived at an understanding and she is wearing his ring. One day four masked men ride into the village, loot the bank, terrorize the community and ride away with a big sack of gold. The sheriff goes in pursuit, and after a lot of shooting, fast riding and acrobatic horsemanship, the bank looters are caught. When the masks are removed, the sheriff discovers to his consternation that the brother of the handsome widow is the chief of the band. Duty stares at him with unsmiling face.
Bill Miller, youngest member of the notorious Range Riders, gets job as pony express rider. Indians become dangerous on the war path. Bill forestalls plan of a bandit chief to rob mails while trying to win the love of a girl and the respect of "Uncle Sam."
Two men claiming to be scientists arrive in Arizona looking for Blair, a fellow scientist who disappeared while developing a death ray. The men hire Jim Wilson, who finds Blair living with his daughter on a ranch in an inaccessible valley near the Grand Canyon, where the scientist is testing his ray on birds and wild animals.
Chick Newton's friend, Bill Warner, is arrested for murdering his uncle. However, Bill has been framed by a blackmailer who has plotted with the uncle to have him disappear in order to avoid creditors and collect insurance. Newton unmasks Tom Curtis as the culprit and rescues Warner from a hanging.
Carrie Simpkins, a lady lawyer, arrives in a small western town and begins the practice of law. Pete, Jake and Jerry, three cowboys, fall in love with her, but do not progress. Smithers, the pioneer town lawyer happens by and sees the sign, "Carrie Simpkins, Lawyer," and decides to pay her a visit, which he does, and he also falls in love with her. Pete, Jake and Jerry all hit upon the same plan unknown to each other, which will help their chances with Carrie.
Grace Martin, the adopted daughter of Sheriff Martin, was rescued by him from a band of Indians when she was an infant. She is in love with Buck Gibson. Grace asks the Sheriff's consent to marry Buck, and his thoughts revert back to the time when he saved Grace from Indians. He gives his consent to Grace's request to marry Gibson, and Grace runs away happy to tell her lover of the good news. That night Buck Gibson and some pals rob the town bank, and Buck is identified as one of the bandits.
Fleeced by a pair of good-time gals, the boys are unable to pay their bar tab and end up cooling their heels in jail. Once released, the two pals decide to join the army, if only to know where their next meal is coming from. They are shipped to a remote frontier outpost, which is already a hotbed of intrigue due to the commanding officer's lust for the wife of one of his officers.