Salomy Jane, a California mountain girl, is sought after by a number of men in the nearby small town of Redwood City. She is affected when two criminals are pursued by authorities: one for killing a hypocritical mayoral candidate, the other for robbing the stagecoach.
In the middle of the mountains around the Lötschental is a lonely village that is exposed to the forces of nature. A state of excitement arouses when an international mining company discover a gold vein and acquired mining rights.
Griffen and his two men have been caught after robbing a bank but the money has not been recovered. So the Chief sends his friend Tom to prison to become their friend and hopes he can learn where the loot is hidden.
Lovers David Lunch and Betty Summers are caught in the feud between their two families. When David kills the Summers son, he escapes to the West. He marries and when his boy is two he and his wife are killed by Indians who take the boy. Twenty years later the boy is now the Indian chief. Betty's daughter is nearby and the two are destined to meet.
O'Hara has been hired to lead a wagon train west. Instead he has led it off the trail to where it can be attacked by his Indian friends. But Tennessee Mathews is familiar with O'Hara's tactics and sends for the soldiers.
A cowboy saves his injured friend from a vigilante group, which believes that he is part of a bandit gang that attacked a wagon train. The cowboy sets out to find the bandit gang and clear his friend's name.
Kincade and Blake cause a mail plane carrying a payroll to make a forced landing in the desert. When they try to get the money, prospectors Ted and Si drive them away. With the pilot shot, Ted takes over as pilot figuring another attempt will be made and this time the Sheriff will be there.
While the original title, "Trailing the Killer" isn't a misnomer, it was a bit misleading since the "trailer" is a dog named Caesar (Caesar the Dog) and the killer is a mountain lion. But the makers also pointed out that Caesar "is the most intelligent dog actor since Rin-Tin-Tin" which probably lured a few Rin-Tin-Tin fans with a show-me attitude. Caesar prowls around the woods of the Northwest, dispatches a rattlesnake, visits his she-wolf mate and their pups, pauses to watch the dainty habits of a raccoon personally washing every morsel of food before eating it---and that raccoon had enough food to use up several minutes of running time---and then saves sheepherder Pierre (Francis McDonald)) from getting eaten by one mean mountain lion. Rin-Tin-Tin he ain't, but then who was?
Ken not only has to fight with his brother Wally over the girls, he has to try and stop the conflict between the cattlemen and the sheepmen. It gets worse when Butch kills Judy's father.
A con man posing as a lawyer tries to sell copies of a phony law book. Things get serious when he has to defend a young man falsely accused of robbery.
Cowboy is hired by an archaeologist to help find "Hidden Valley", where an Indian gold treasure is supposed to be buried. Just when he finds it, the archaeologist is killed, and the cowboy his charged with his murder.
Gregory is a phony government agent issuing worthless checks. To keep from being exposed he has his men dress as Indians and attack anything bringing mail. This leads to an Indian war. White Eagle, a pony express rider, exchanges his buckskins for his native Indian garb, and sets out to end the war.
A man accused of murdering a sheriff, escapes a posse and joins a gang at the Bar-O-Ranch. The mistress of the ranch is about to be cheated out of her land, but the wanted man helps her against the gang and bests the leader in a fight.
Retiring from a life of train robbing, Benjamin R. Jones takes over the ghost town of Stillwell, knowing full well that the property belongs to Molly O'Rourke. Enter horse wrangler Tom Mason, who smells a rat and does his best to unmask Jones as the crook he knows him to be. Molly at first falls for Jones' scheme, but confronts him when a general feeling of lawlessness sets in. The villain, alas, has an ace up his sleeve: Molly owes back taxes on her property, which is ripe for a takeover.
Sam Dunning, one of the wealthiest ranchers in the Pecos Valley is found dead with a bullet in his back. Pinned to his body is a note which reads "An eye for an eye, signed Joan Stanton". Danger follows for Larry, a Texas Ranger. Will his sense of chivalry allow him to bring in a woman to face the charge of murder? Along the way, several cowboy tunes and fine locations contribute to the picture's Texican atmosphere.
Ride Him, Bosko! is a western-flavored cartoon with lots of shooting gags involving body reduction, and card characters singing! There's also an alcohol gag that has a really strong one turning a male piano player into a woman instantly!