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Volume 19: The Disappearing Floor
Frank and Joe find themselves trapped in a house of illusions as they investigate a series of bizarre accidents at a local amusement park. As they unravel the mystery of the disappearing floor, they uncover a plot involving stolen inventions and industrial espionage. With the assistance of their friend Chet Morton, the Hardy Boys must use all their ingenuity to outwit the criminals and prevent a technological disaster.
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