Will Parker has been destroyed by a local politician and now must steal to feed his family He steals a steer from the Three Mesquiteers
Foreign agents are smuggling monium a chemical used in producing poison gas into Mexico The three Mesquiteers get involved when they ride to save a girl really a government agent on a runaway horse
The Three Mesquiteers convince a group of settlers to exchange their present property for some which, unbeknownst to our good guys, is going to be worthless They are captured before they can warn the ranchers
After gold shipments from a mining town have been hijacked, the three Mesquiteers buy a plane to fly the gold out The owner of the shipping line brings in Eastern gangsters to thwart them
Talbot uses a phony land grant to rule thirteen million acres, taxing everyone heavily and evicting those who wont pay The Three Mesquiteers becomes mysterious night riders to fight this evil
The Mesquiteers capture a horse thief who escapes justice through a crooked judge They gather signatures urging the governor to investigate but a friend with the petition is murdered Stony is accused
Very organized cattle rustlers are operating with portable slaughterhouses and refrigerator vans The governor asks the Three Mesquiteers to go undercover to investigate
A circus owner, for sentimental reasons, wont sell her ranch Her business partners secretly sabotage the circus to force a sale but her neighbors, The Three Mesquiteers, hope to thwart their plan