The Disappearing Floor
Appearance
The Disappearing Floor is Volume 19 in the original Hardy Boys book series published by Grosset And Dunlap.
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The original text edition is generally regarded as the worst written story in the canon.
The Hardy Boys smash Duke Beeson's (AKA Chief Shining Light Of The Sun-Worshipping Ozonites) robbery gang using the weird inventions of Aunt Gertrude's former classmate, Eben Adar.
Revised: The Hardy Boys track down a gang of jewel thieves in a mysterious old mansion.