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The Hardy boys' search for stolen gold leads them to an abandoned mine where, in the depths of the earth, they are attacked by outlaws.

Frank and Joe unravel two mysteries, one involving a counterfeiting case and the other concerned with a national security case on which their father is working.

The Hardy boys and their father solve a mystery involving inexplicable crashes of high-speed race cars being used to test an experimental turbine motor.

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

The inhabitants of Morgan's Quarry try to keep the town's secrets from the Hardy Boys.

Collects three novels featuring the Hardy Boys, including "The Tower Treasure, " in which Frank and Joe help their dad discover who robbed a neighbor; "The Secret of the Old Mill, " in which the boys investigate a counterfeiting, and a national security case; and "The Haunted Fort, "in which Frank and Joe are joined by their friend Chet in a dangerous search for stolen paintings.

Frank and Joe go to the Pocono Mountains to investigate the mystery of a legendary witch who stalks Black Hollow seeking vengeance.

In the Northwest Territories of Canada, the Hardy brothers and Chet Morton help to recover a stolen Viking relic.

While helping their father search for the "Ivory Idol, " Joe and Frank discover a connection between their current case at a carnival in town, a stuffed whale dug up at a local construction site, and the "Ivory Idol.

Frank and Joe are confronted with the crisis of water disappearing from the reservoir at Skull Mountain.

Frank and Joe protect the son of the President of the U.S. during the Winter Max-Games.

After a dying criminal confesses that his loot has been stashed "in the tower," the Hardy boys make an astonishing discovery.

A "monster" who terrorizes Bayport and a girl who runs away to join a cult are the subjects of the Hardy boys' sleuthing.

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

The Hardy Boys are given clues which send them in search of the treasure hidden by the Outlaw of the Pine Barrens.