When Professor Marsh disappears while searching for the lost city of Lukachukai, his daughter enlists the help of the Three Mesquiteers.

When Tex is brought in to fight in a range war between the cowmen and the nesters, he meets his old outlaw boss Lassiter. He learns Lassiter is behind the feud when Lassiter asks him to join up with his gang. Tex refuses and instead sets out to stop the feud but no one will believe him that Lassiter is responsible.

A rancher caught in the middle of a bank robbery shoots one of the robbers. However, the dead bandit turns out to be a former ranch hand who was suing him. The rancher is arrested for murder.

When this propaganda film begins the narrator states that before the beginning of World War II, Japan was the only one of thirty-five nations to refuse to sign an anti-narcotics treaty and alleges that this was because the country's leaders planned to use drugs as a weapon of war.

A reporter risks lynching to prove that share croppers are being cheated.

A doctor fights an epidemic that breaks out in the poor section of town and tries to get the rest of the town to help out.

In the second film of the series (and not a second part of anything), Gay Lawrence, aka The Falcon, is about to depart the city to marry his fiancée, Helen Reed, when a mystery girl, Rita Mara, asks for his aid in disposing of a secret formula for making synthetic diamonds. He deliberately allows himself to be kidnapped by the gang for which Rita works. His aide, "Goldy" Locke, trails the kidnappers and brings the police. But the head of the gang escapes, and the Falcon continues the pursuit.

After being shown what hypnotism can do, a doctor starts to study it in depth. When he experiments on a friend's wife, she regresses into an early life, that of Bridey Murphy.