The Three Mesquiteers answer their friend Dave Carson’s (William Farnum, former silent screen star) call for help. Dave strikes gold in his New Mexico mine that the boys helped him with a grubstake and offers to split the profits. He’s concerned that crooked town mayor Gilbert Byron intends to steal the mine from him and frets that he uses his office to make the law work in his favor. Things get hairy when the Mayor’s henchmen kill Dave and his young daughter (Genee Hall) who are riding in a buckboard with the petition to give to the governor to get law-and-order restored while Stony goes on a different route to file the mine claim. Stony gets framed for the murder (the motive suggested by the Mayor is that he stole Dave’s claim and then killed him). The Mayor’s henchmen stir up a mob of the townspeople to go after Stony in the jail. With the help of the Mesquiteers and the honest marshal (Tom London), Stony survives that attempt. He then goes on to prove his innocence and round up the criminals by setting a trap for them.