Summary of the book The Clue in the Crumbling Wall?

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When Nancy is asked to find a professional dancer who disappeared

several years before, the young detective becomes involved in a

mystery reaching far beyond a missing-person's case. During Nancy's

investigation at Heath Castle, she and her friends Bess Marvin and

George Fayne see that the crumbling walls contain a secret. Danger

follows the girls in the castle and there are enemies that try to

foil their every attempt to solve this mystery.