Hoppy and his pals arrive in a remote town to investigate the counterfeiting of both U.S. and Mexican money; his only clues are the name "Mordigan" and a drawing of a comet. He quickly finds out that Mordigan is the town "boss"; but what or who is "the comet", and why are Mordigan and his henchmen intent on persecuting a young woman, her drunken brother, and her deathly ill sister-in-law who've also just arrived in town?

Bill Harvey discovers a lost mine, rich with gold. Geraldine "Jerry" Howard has the claim to it left her by her father. Bill tells her that the death of the claimant, her father, makes a claim void. Infuriated, she goes to John Kenton, a crooked lawyer, for aid. Kenton sees an opportunity for wealth if he marries Geraldine, but Bill tells her that Kenton is only after her money. She gets more infuriated. While Bill and a posse are raiding an immoral cabaret, Kenton raids the Paradise freight depot to steal the money. The depot catches fire and Kenton shoots his henchman to save himself. The town and Geraldine think Kenton is a hero. It is up to Bill to prove otherwise.