Nancy Drew must search for a flight of 99 steps to solve the mystery of
a friend's weird dream. Her search leads her to France, but before she
leaves the United States, an unknown person calling himself Monsieur
Neuf warns the young sleuth not to pursue her mission.
With her friends Bess and George, Nancy arrives in Paris to join her
father who is working on another case: to find out what, or who, is
frightening wealth financier Monsieur Leblanc into selling large amounts
of securities. Startling discoveries convince the young detective that
Mr. Drew's case and her own mystery are linked by the 99 steps, and that
a mysterious man has a strong hold over Leblanc. Is it blackmail?
Nancy's quest for further clues leads to the romantic chateau country in
the Loire Valley, where a web of danger closes in tightly around the
three girls.