Trouble brews when Bronco is leading a wagon train through the wilderness. It seems that an old army buddy of his is on the train, and he's brought along the runaway daughter of a powerful cattle rancher, who doesn't like it one bit.
A stranded and isolated Bronco is hired by an army officer who rescues Bronco to take him to Sitting Bull's camp, where he has a request to make of the Indian leader. He is under orders to recover a payroll stolen by the Sioux in a raid.
Bronco arrives in a small town right after a stagecoach robbery in which a man has been killed. Suspicion immediately falls upon him, and what he doesn't know is that the robbery was actually committed by an old friend of his.
Bronco finds himself involved in blackmail and murder when he takes a job as deputy with a war hero who rescued him from a lynching. He discovers the man who won the Congressional Medal of Honor during the war may in fact not deserve it.
The outlaw Traxel brothers and gang leader Willis Turner murder Bronco's best friend and then frame him for the crime. The only thing that can save him is the testimony of a young girl who knows that Bronco didn't do it--but she's a mute.
Bronco hired as shotgun by the Silver Flats bank is saved from certain death at the hands of a gunfighter by the quick wits of Rev. Dave Clayton, which leads to the confirmation that the preacher may not be exactly who he says he is.
Bronco is a deputy under Sheriff McKeever who has a reputation for having cleaned up Two Pines in the past but his age is showing. When he is killed after a bank robbery, Bronco's investigation leads him to some surprising conclusions.
Bronco gets a position teaching cadets at a military academy, but his job turns from instructor to investigator when a cadet runs away after learning he is half-Sioux and Bronco thinks his life may be threaten by a future stepfather.
Bronco, hired on as trail boss on a cattle drive, tries to avoid outside problems. However, his troubles grow when he is forced to help a naval officer and comes up against a seductive woman who seems to have more than one husband.
Outraged at becoming unwittingly implicated in a payroll robbery and murder, Bronco sets out to find the inside person who can clear him and bring back the money. He doesn't have a whole lot of time, however, as he is being hunted.
A bank clerk in Dusty Flats is found dead after a $10,000 bank robbery--with Bronco's gun in his hand and Bronco knocked out. Bronco is branded a coward and the clerk a hero so Bronco tries to find the three men responsible on his own.
Bronco is hired to deliver a riverboat to his friend Martha Chandler. He hasn't counted, though, on a ruthless businessman who doesn't want the ship to complete the trip, and a beautiful blonde passenger who has her own agenda.
Bronco introduces a pretty young girl to a wealthy older man, not knowing that the girl is actually a con artist out to fleece the man and his friends of everything she can get. Bronco finds himself in the middle of the situation.
Bronco rides into a town and finds himself confronted by a man from his past who shoots him. While testifying at the court martial of the man who tried to kill him, Bronco finds himself reliving his experiences during the Civil War.
Bronco is hired to protect Frank Kelton by sticking with Dan Flood who is threatening to kill him, but when Kelton is killed, Bronco finds himself with no shortage of suspects - a whole string of people confess to killing him.
Cattlemen and sheep men are in dispute over grazing. Bronco doesn't want to get involved but has to step in before a range war breaks out, mainly because Billy the Kid wants to back the sheep men who refuse to use guns in the fight.
Pursued by Marshall Gaffney for a robbery he did not commit, Bronco rides to the town of "Last Resort" - a hideout for outlaws on the Mexican border. There Bronco hopes to clear his name by finding the real robber who framed him.
Ambushed and shot by an escaped prisoner, Bronco is saved by a rancher, but finds himself drawn into the rancher's feud with a nearby family. Bronco is there to arrest the prisoner who is the brother of the rancher who helped him.
Bronco rescues and hires a mother and son who are refugees from the fallen empire of Emperor Maximilian of Mexico, but he soon discovers that bandits who believe the two know where $5 million in gold is buried are after them.
Bronco accompanies a corpse for $25 by train to Denver. On the same train is a friend escorting $100,000 plus a pretty blonde. At the end of the trip he finds himself in jail for stealing the money and then forced to find it by two men.