Teacher Lola Blair is against building the saloon right next to her schoolhouse; when she is kidnapped, Hoppy rescues her and forces the saloon keepers to relocate.

A banker is trying to cheat people out of their silver-rich land; Hoppy learns that the banker is in league with an outlaw gang.

Hoppy is an agent of the federal government investigating the counterfeiting of both U.S. and Mexican money; his only clues are the name "Mordigan" and a drawing of a comet.

At the reading of his late cousin's will, California learns the estate will be divvied among whoever remains of the seven relatives; with one already dead, Hoppy investigates.

Hoppy, California and Lucky come across bank robbers who drive automobiles; nevertheless, the Bar 20 guys bring the bad guys to justice.

Three bodies turn up in a frontier hotel; Hoppy solves the murders and chases the killers through unusually misty and dark locations.