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Young detectives Frank and Joe Hardy, investigating the disappearance of a professor, encounter a hot-tempered hermit, and sabotage at the radar station and Honeycomb Caves.

When the Hardy Boys set out to solve the mystery of their missing chums, they discover a gang hide-out in a cave on an island along the way.

Frank and Joe solve a mystery involving a missing man, an abandoned airplane and giants in the desert.

On an ice-bound, snow-covered island, Frank and Joe attempt to solve the mystery of a boy's disappearance and the theft of a priceless collection of antique medals.

While searching in Iceland for a missing sailor sought by an insurance company, the teen-age detective brothers uncover a plot threatening the life of a United States astronaut and the secrets of NASA's moon project.

When Mr. Hardy disappears while investigating a mystery surrounding a vacant house rumored to be either haunted or an abode for criminals, the Hardy Boys search for the truth.

The Hardy brothers' search for the missing son of a wealthy industrialist leads them to Brazil and great danger.

A Japanese business tycoon mysteriously disappears and, soon after, a rare samurai sword is stolen from an art gallery.

Two teenage sleuths help their detective father search for a famous rocket scientist whose disappearance endangers the launching of the Firebird Rocket.