Nancy is asked to help find a missing professional dancer who vanished several years earlier and becomes involved in a mystery involving the mysterious Heath Castle.
During their investigation at Heath Castle, Nancy, Bess, and George realize that its crumbling walls contain a secret, but what is it?
They search for clues in the neglected gardens of the vast estate, hoping to find a lead to the missing woman.
Danger lurks in the castle tower and all throughout the vine-tangled grounds as Nancy exposes a sinister plot to defraud the dancer of her inheritance.