When Frank Adams, a government engraver, disappears in Nevada, treasury agent Steve Crockett turns to his nephew, Terry McVey, for help. Counterfeit bills bearing Adams' signature are circulating in the town of Silver City, Nevada, prompting Steve to surmise that the counterfeiters have been using the casino at the Silver Bar Guest Ranch to launder money. Because Terry owns a ranch in the area, Steve asks him to go to Silver City and investigate. Soon after Terry leaves his uncle's office, Barbara Adams, the missing man's daughter, visits the agent and sees a note on his desk with the name "Silver Bar Guest Ranch" written on it. In search of her father, Barbara takes the next train to Silver City, where she registers at the ranch using the alias Barbara Allen. Meanwhile, Terry has also arrived in Silver City and tries to recruit his friends Smokey and Whopper Hatch, to join the investigation. Smokey and Whopper, the proprietors of a traveling medicine show, are reluctant to help their friend until they are all jailed for disturbing the peace and the judge forces them to sell their medicine wagon to pay their fine. Miss Carter and Gail Sergeant, guests at the dude ranch who are also admirers of Smokey and Whopper, hire the unemployed trio to entertain at the ranch. There, Terry discovers that chips at the casino are being exchanged for counterfeit money. The leader of the ring is Gordon West, the owner of the ranch. When West's henchman, French, takes his daily ride, Barbara, hoping that he will lead her to her father, follows him. Terry also follows French, who leads them to the cave where Adams is being held. Inside the cave, Barbara inadvertently knocks over a barrel, alerting the gang to her presence. After Barbara is captured by the gang, Terry rides back to the ranch, where he instructs Whopper and Smokey to wait in the bunkhouse while he calls Steve in Reno. As Terry begins to dial his uncle's number, French returns to the ranch and cuts the phone wires. After Gail tells Terry that Barbara's last name is really Adams, he realizes that she must be Frank Adams' daughter, but before he can relay the information to Reno, Terry and his friends are taken prisoner by West's gang and sequestered in the bunkhouse. When Miss Carter, who has a crush on Whopper, pounds on the bunkhouse door, demanding to see him, Terry uses the diversion to pull a fake stick of dynamite from his pocket and threatens to throw it in the fire unless their captors surrender their guns. Terry then instructs Pop Stebbens, the new owner of the medicine wagon, to ride to town for the sheriff while he, Smokey and Whopper take the wagon and rescue Adams. At the cave, the three shoot it out with the counterfeiters until the sheriff and his posse come to their aid. With West and his gang under arrest, Miss Carter buys the Silver Bar and offers Whopper the job of foreman. Whopper accepts her offer until he realizes that marriage is part of the job description.