Perry Murdock

Cowboy Larry O'Day and his sidekick Lucky Smith happen upon a distraught Barbara Hartwell, who is about to be arrested for the murder of her uncle. With Barbara behind bars, Larry is determined to find the real killer and soon finds himself in the middle of a mystery involving crazed German entomologists and a smuggling ring bringing Chinese "picture girls" across the Mexican border for sale to wealthy Chinese bachelors.

Jimmy Dixon, pursued by a band of Mexicans, changes clothes with a tramp, who takes off on his horse. Four miles later, Jimmy walks onto the Double-O Ranch, from which he had been thrown off four years before by his dad, who had blamed Jimmy for something that his twin brother Duke had done. Duke, home from college, took over the ranch when Mr. Dixon became ill, and has run it into the ground. When Duke goes to the bank to repay a debt to Jimmy, he rides onto Phoenix with all of the ranch money.

The parents (Horace B. Carpenter)(Vane Calvert) of Smokey Smith (Bob Steele) are murdered while traveling with a wagon train that is attacked by outlaws. Smokey swears revenge but his only possible chance lies in finding the member of the border-gang who took a ring from his father's finger. The sheriff (Earl Dwire) of a nearby border town makes Smokey a deputy after the latter saves his life when outlaws attack a stagecoach the sheriff is escorting. This enables Smokey to find the hideout of the gang that killed his parents, and he, posing as a wanted man, is able to join the gang. He soon incurs the wrath of gang-member Kent(Warner Richmond), who is jealous over the attention that Bess Bart (Mary Kornman, step-daughter of the gang-leader, "Blaze" Bart (George 'Gabby' Hayes), is showing Smokey.

In 1889 pioneers race ahead of the law to claim free land in Oklahoma, forming wide-open towns. In one such, citizens elect Milt Dawson to challenge the self-appointed rule of gambler Ace Holmes, only to have him shot in the back. But leading the next batch of settlers is Milt's quick-on-the-draw son John, who gets help from friendly outlaws.

Intent on avenging his father's murder, Roy Neal and his sidekick Rusty find themselves in the border town of Gladstone where Neal is mistakenly arrested for the robbery of a mail truck. After escaping, Neal joins up with pretty June Bowers whose father has apparently also been murdered. Neal, suspecting two of the town's leading businessmen of being the murderers, tries to flush them out before the sheriff can lock him up again.

John Wyatt is a government agent sent to smash a counterfeiting operation near the Mexican border. Joining Doc Carter's medicine show they arrive in the town where Curly Joe, who once framed Carter, resides.

The man Bannister has sent to investigate the trouble at his mine has disappeared. This time his son Bob goes, quickly learning that Kincade is the culprit. Kincade has been taking gold from the mine and now plans to kidnap Teresa and skip across the border.

Dyer is buying ranches and then retrieving his check by having his gang kill the owner. Bob Worth arrives just as Buck Morton is killed and gets blamed for the murder. Fleeing from the Sheriff, Bob teams up with the Mexican outlaw Golinda. Having seen Dyer pay off his men, he has a plan to trap him and Golinda is just the man he needs to make it work.

The Marshal sends John Weston to a rodeo to see if he can find out who is killing the rodeo riders who are about to win the prize money. Barton has organized the rodeo and plans to leave with all the prize money put up by the townspeople. When it appears that Weston will beat Barton's rider, he has his men prepare the same fate for him that befell the other riders.

Three men, each on their individual quest, meet at a deserted cabin and take the assumed names of Ace, King, and Jack.