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

Nancy takes a vacation in Wisconsin when the library of the place she is vacationing at is vandalized. 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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This article about a young adult novel of the 1990s is a stub. You can help Wikipedia by expanding it. See guidelines for writing about novels. Further suggestions might be found on the article's talk page.

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