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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.

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In solving the mystery of two medallions missing from an inherited curio collection, the Hardys wind up in a desolate area of Guatemala at the mercy of dangerous thugs.

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Hired to locate an old Spanish cannon, the Hardy brothers uncover an even greater treasure after perilous underwater adventures.

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A cryptic note from their father leads the Hardy boys to the Caribbean where they must solve the mystery, but only if they can successfully evade the henchmen who are trailing them.

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When they journey to Alaska to help a friend who feels his life is in danger, the Hardy brothers find their own lives threatened.

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Originally published by Simon & Schuster in 1960.

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The Hardy boys travel to Mexico to solve the mystery of a missing plane and its passengers. Their only clues are giant desert drawings made by Native Americans hundreds of years ago.

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The Hardy boys go to the Pocono Mountains to help a friend of their father find out what is behind the mysterious happenings at Black Hollow. In the process they help their father solve a case involving a ring of thieves.

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The Hardy boys find mystery in the Canadian Northwest when a carved rune stone left by Vikings is found near Great Slave Lake.

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Originally published by Simon & Schuster, c1965.

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When their father is kidnapped while investigating a case of sabotage, the Hardy boys must come to his rescue.

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Frank and Joe, the Hardy boys, solve a mystery involving a magician, American secret agents, and international spy ring, and a Scottish castle.

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Helping in a case their father is working on, the Hardy brothers try to find an informer who has telephoned from a booth in their home town, and are hired by a carnival owner to spot pickpockets.

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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.

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The Hardy boys and two friends take a camping trip to the Rocky Mountains in an attempt to locate a gang of credit-card counterfeiters.

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

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The Hardy brothers' visiting Greek pen pal enlists their help in searching for a priceless ancient Greek helmet loaned to and lost by a Hollywood movie company years before.

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Their efforts to recover a stolen ancient chess piece lead the Hardy brothers to Hong Kong where they help smash an international criminal organization.

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On a winter vacation in Jamaica the Hardy boys begin a dangerous adventure when an ancient bronze death mask is discovered near their beach house.

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The Hardy boys' investigation of a museum robbery in England arouses the anger of a coven of black witches.

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The search for missing gold takes the Hardy boys to the Yucatan Peninsula where they uncover a second mystery.