Donald Custer loses in a poker game to 'Ace High' having forged his father's name to a check. Knowing the game was crooked, Buck returns to retrieve the check only to find Donald already there and Carlotta dead. When Buck sends Donald away, things look bad when 'Ace High' finds him with the body.

A town bedeviled with outlaws sends for Hoppy, Lucky and California after their own vigilante committee fails to solve the towns problems. Hoppy discovers that the bad guys are led by the town boss, and so are the vigilantes.

A ranch owner mistakenly believes that a neighboring rancher is involved with cattle thieves.

A rancher's son finds himself helping another rancher who is at odds with his father--all because of the father's crooked partner.

A bandit who robs both Americans and Mexicans is causing each side of the border to blame the other. Hoppy has to settle matters.