Reporter Speed Morgan helps Flash Barrett escape from the police and this gets him into Flash's gang where he poses as a gangster. Flash and his gang head west guning for Bill Miller who failed to send some diamonds on to Flash. Speed hopes to bring Flash to justice but is in trouble when his true identity is revealed.
The Llano Kid is robbing stages but only taking money from Montana Slade's Cottonwood Mine. He then gives the money to those cheated by Slade. The Sheriff is after him and eventually obtains a picture and displays wanted posters and is soon after him.
Lone gunman Johnny West and his dog, Gypsy, fall foul of twin bad men who have designs on a gold mine. After having his gun hand crushed Johnny is joined by 2 feuding ex boxers and their explosive expert sidekick as they all take on the villains, restore the mine to it's rightful inheritor and face down the twins, one of whom attempts to outwit them using a clever coffin trick.
A famous bandleader, suffering from overwork and exhaustion, goes to a sanitarium for a rest. While there he dreams of being out west at a dude ranch, where he finds himself involved in the beautiful owner's struggle to keep her ranch from falling into the hands of the villain, who wants either her or her ranch (or, preferably, both).
Two old drunks named Gin & Whiskey Joe, with their mules, engaged in a personal fight, find some gold nuggets in a river, they decide to look for the remaining ones through a map which they divide in half, gangs of bandits hear of the news and cast all suspicions on the holders of the map to two homosexual cowboys, who will seek refuge in a nunnery.
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.
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?
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.
As foreman of a dude ranch, Gene has two problems. One is a guest, the spoiled daughter of a millioniare, and the other is the disgruntled ex-foreman that Gene replaced, now just a ranch hand. Gene eventually gets the daughter straightened out but has to fire the ex-foreman and this leads to trouble when he returns intent on revenge.
Ben Hall offers $1000 for the wild Devil Horse which Jim Wright and Skeeter capture. While Jim is away, Gil Davis kills Skeeter and takes the horse. The Sheriff then arrests Jim for Skeeter's murder. But unknown to them, an outlaw witnessed the killing
Both the Range Buster and Rance and his outlaw gang are looking for stolen gold bullion. To scare people away from the ranch where the gold is hidden, Rance has his man imitating ghosts. The gold is in a steel cased organ but a certain combination of organ stops need to be pulled to obtain the gold.
Ex-Pony Express rider Autry ties to protect his US mail franchise as the Pony Express gives way to stage coach mail and the telegraph. Gene's last film appearance as a singing cowboy.