Nancy is asked to help a young French engineer who has uncovered a mystery surrounding an 18th-century ancestor in a letter found among his grandfather's papers.
As the young detective attempts to solve one mystery, she also investigates a series of strange incidents at the River Heights Arts Institute. Although nothing is ever taken, the Institute is plagued with burglaries!
Undaunted by attempts to stop her, Nancy uses her incredible sleuthing skills to follow the mysterious clues, including an amazing find in an old costume, and unravel this intriguing tale!
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