On vacation on the Greek isles, Nancy, Bess, and George are horrified when someone steals their passports from their hotel room, and soon the trio of friends is in hot pursuit of terrorists.
Undercover at Brewster Academy to investigate a grade-changing scheme, Nancy must find out who has penetrated the school's computer and is extorting money from students in exchange for upgrading their records.
Nancy is abducted by terrorists when she poses as a government courier to deliver a document vital to top-secret negotiations with a country on the brink of revolution.
When her boyfriend is injured under mysterious circumstances during a trip to Yellowstone National Park, Nancy arrives on the scene and uncovers a criminal plan to steal the park's native animals.
