In New Mexico, Beau Maverick is taken for over $4,500 ($4,000 of which belong to his friend Jerry O'Brien) by con artists Warren and Crippen and Warren's granddaughter Rosanne. Beau tries to recover the money and even takes the threesome to court, but they outsmart him every time. Beau is so demoralized by the constant defeats, he believes he has disgraced the Maverick name - until Rosanne tells him that her grandmother was a Maverick.

Beau Maverick wins half-ownership in the Blue Bell Saloon in Arizona. In an attempt to raise funds for the floundering business, Beau and his partner Charlotte become partners with a mysterious gold prospector known only as the Dutchman. Along the trail to Superstition Mountain where the gold is located, Beau, Charlotte, and the Dutchman encounter danger in various forms.