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Shaun Cassidy and Parker Stevenson play Franklin W. Dixon's teenage sleuths Joe and Frank Hardy in this 48-minute spine tingler, originally titled "Mystery of the Witches' Hollow." Things start hopping when the uncle of Joe and Frank's classmate Calley (Lisa Eilbacher) disappears. The only clues to Uncle's whereabouts are the mysterious drawings made by a young mute boy (Gary Springer). Could an ancient witches' curse be at the bottom of things? "Mystery of the Witches' Hollow" was first telecast February 13, 1977.