Title: The flight of the Silver Turtle
Description: Ben, Zara, Sam, and Marcia begin their summer vacation by helping Professor Ampersand and a new friend build the Silver Turtle, a futuristic airplane, but on the day the first test flight is planned, a strange woman steals the airplane with the children inside.
Subjects: Adventure and adventurers, Juvenile fiction, Airplanes, Fiction, Science fiction, Inventors, Children's fiction, Adventure and adventurers, fiction, Airplanes, fiction, Inventors, fiction