The Moonstone Castle Mystery

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The Moonstone Castle Mystery
Author Carolyn Keene
Country United States
Language English
Series Nancy Drew Mystery Stories
Genre Juvenile literature
Publisher Grosset & Dunlap
Publication date
Media type Print (hardback & paperback)
Preceded by The Clue of the Dancing Puppet
Followed by The Clue of the Whistling Bagpipes

The Moonstone Castle Mystery is the fortieth volume in the Nancy Drew Mystery Stories series. It was first published in 1963 under the pseudonym Carolyn Keene. The actual author was ghostwriter Harriet Stratemeyer Adams.


Nancy receives a moonstone as a gift from an unknown person; she is amazed yet puzzled. She then finds herself involved in a case involving the Bowens and their missing granddaughter, Joanie Horton. Clues lead Nancy, Bess, and George to the haunted Moonstone Castle along the Deep River.