The Hardy Boys / Nancy Drew Mysteries (1977) : The Disappearing Floor
Frank and Joe search for answers when Fenton is taken off the Project K case.
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1 - 1The Mystery of the Haunted House January 30, 1977 -
1 - 2The Mystery of Pirate's Cove February 06, 1977
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1 - 3The Mystery of Witches' Hollow February 13, 1977 -
1 - 4The Mystery of the Diamond Triangle February 20, 1977 -
1 - 5The Disappearing Floor March 06, 1977 -
1 - 6The Secret of the Whispering Walls March 13, 1977 -
1 - 7The Flickering Torch Mystery March 27, 1977
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1 - 8A Haunting We Will Go April 03, 1977
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1 - 9The Mystery of the Flying Courier April 10, 1977
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1 - 10Mystery of the Fallen Angels April 17, 1977
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1 - 11Wipe Out April 24, 1977
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1 - 12The Mystery of Ghostwriters' Cruise May 01, 1977
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1 - 13The Secret of the Jade Kwan Yin May 15, 1977
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1 - 14Mystery of the Solid Gold Kicker May 22, 1977