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Two of the Hardy Boys's chums take a motor trip down the coast. They disappear and are almost rescued by their friends when all are captured. A thrilling story of adventure.

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The Hardy boys must brave a blizzard, a mine cave-in, and hungry timber wolves in an effort to search for the gang responsible for a robbery.

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The Hardy boys agree to help a friend and his father find a family treasure. When the friends disappear, the sleuths find themselves faced with two mysteries.

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A banker who has been receiving threatening notes enlists the help of the Hardy boys. Before very long, the young sleuths find themselves entangled in the investigation of a notorious band of thieves.

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In an effort to recover a top-secret instrument needed by the space program, the Hardy boys travel to South America, hot on the trail of a notorious ring of spies.

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The search for a missing boat leads the Hardy boys and their father down to Mexico where they encounter a tribe of Indians.

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The Hardy Boys and their father solve a mystery involving inexplicable crashes of highspeed race cars being used to test an experimental turbine motor.

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A blind peddler's warning and a glass eye plunge Frank and Joe Hardy into a baffling case.

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The owner of a gold pharaoh's head claims it was aboard the freighter Katawa, but suspicions arise that he is trying to defraud the shipping line's insurance company.

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When their father asks for help tracking a jewel thief, the Hardy boys find that the trail leads them back to their own hometown. There, they begin a new investigation of a mysterious death which occurred many years ago.

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After the new hydrofoil they are guarding is stolen, the Hardy boys face frequent danger in solving a mystery involving criminals who operate by signs of the zodiac.

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While searching for the guard end of a broken saber that will solve one mystery, the Hardy brothers become involved with a gang of bank robbers.

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Suspecting that their friend has been swindled, the Hardy brothers investigate and find themselves on the trail of a much larger criminal operation.

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The theft of a collection of stuffed animals from a country auction draws Frank and Joe Hardy into a thrilling mystery.

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A chance meeting with a stranger on the road provides the Hardy brothers with a clue to a gang of local burglars.

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The Hardy brothers embark on a freighter trip under mysterious circrcumstances and find themselves involved with a smuggling ring.

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The Hardys team up with a team of engineers to discover how water is disappearing from Bayport's new reservoir near Skull Mountain.

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The Hardy brothers interrupt their investigations of jewelry-store holdups to answer a plea from their cousin on a New Mexico cattle ranch.

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The Hardy brothers accept the challenge of vindicating a Confederate general accused of stealing hidden gold which belonged to a a bank.

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Stranded by a sudden storm at sea, the Hardy boys discover a wallet containing two thousand dollars. Upon returning home, they learn that a truck loaded with rifles has been stolen. Even though the two events seem unrelated, they are but the first clues in a complex mystery.

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The Hardy boys follow a thief to a Native American village. There, the residents ask for the boys' help in recovering the deed to their land before the land is claimed by strangers.