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The Castle Mystery (Boxcar Children, Bk 36)
The Castle Mystery - Boxcar Children, Bk 36 Author:Gertrude Chandler Warner Grandfather's friend, Carrie Bell, is restoring an old castle. She invites the Aldens to help out. The boxcar children can't wait to stay in the castle, especially when they learn about the mystery of the missing Stradivarius violin.