Carolyn Keene
31) The sky phantom
Author
Description
While vacationing in the Midwest with her friends, Nancy Drew investigates a mysterious magnetic cloud, searches for a hijacked plane, and hunts a horse thief.
39) April Fool's Day
Author
Description
Nancy and her friends go to an April Fool's party thrown by a classmate and they investigate when the expensive electronics belonging to two of the guests go missing.