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 divied among whoever remains of the seven relatives. With one already dead, Hoppy investigates.

Hoppy, California and Lucky are on vacation, but not for long. They come across bank robbers (who drive automobiles, something new). 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.