Treasure in the Royal Tower is a young adult novel by Carolyn Keene in the Nancy Drew stories.

Nancy, along with her friends George Fayne and Bess Marvin, must survive an unknown assailant while discovering the secret passageways inside of an old castle.

The fourth installment in the Nancy Drew point-and-click adventure game series by Her Interactive, named Nancy Drew: Treasure in the Royal Tower, is loosely based on the novel.

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You can help Wikipedia by expanding it.See guidelines for writing about novels.