Dick Tracy goes up against a villain known as The Ghost, who can turn himself invisible.

A Martian invader crashes his spaceship conveniently close to the workshop of a scientist who is developing an interplanetary craft. If the extraterrestrial Purple Monster can complete the rocket ship and return to Mars, he will be able to start a full-scale invasion of Earth. Good thing Craig Foster sets out to thwart the Monster's mission!

A famous scientist and his beautiful daughter travel to Indochina to find an ivory disc that has the formula for a deadly gas engraved on it. An evil doctor and his gang are also looking for it.

A valuable gem from India is stolen in an old dark mansion and it is up to Scotland Yard inspector Charles Irwin to find out who did it among all the suspects who were in the house.

A charming and very daring thief known as Arsene Lupin is terrorizing the wealthy of Paris. He even goes so far as to threaten the Mona Lisa. But the police, led by the great Guerchard, think they know Arsene Lupin's identity, and they have a secret weapon to catch him.