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.