150 pages
English language
Published Nov. 20, 1990 by Dutton Children's Books.
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In 1876, on the eve of the Centennial Exposition in Philadelphia, twenty-year-old Vesper Holly and her friends clash yet again with the archfiend Dr. Helvitius, whose evil schemes plunge them into danger in the wild Pennsylvania countryside.
Subjects
- Adventure and adventurers -- Fiction
- Pennsylvania -- Fiction