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The Hardy boys track down the saboteurs who kidnapped their father.

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.

When their peregrine falcon brings down a homing pigeon carrying rubies, the Hardy brothers find themselves involved with kidnappers.

Frank and Joe search for their father who has been kidnapped while working on a case at the sci-fi theme park, The Fourth Dimension.

Princess Salamaji of Rashipah arrives in Bayport to attend school, bringing her pet snow leopard Emi to stay at the nearby zoo, but Emi and the princess are both kidnapped and Frank and Joe Hardy must battle jaws, claws, and the more dangerous human animal, to set them free.

At the world-famous dolphin research center in Hawaii, the Hardys learn that a dolphin has a mysterious injury and one of the researchers has disappeared.