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The Moonstone Castle Mystery

The Moonstone Castle Mystery When Nancy receives a valuable moonstone as a gift from an unknown person, she is amazed and puzzled. She soon becomes involved in a mystery involving the Bowens and their missing granddaughter which leads Nancy, Bess, and George to Deep River. Investigating the haunted Moonstone Castle leads to a connection between the castle and the mysterious moonstone and the revelation of what happened to Joanie Horton.