Title: The sky's the limit!
Description: Brothers Phineas and Ferb attempt to break the record for the largest airplane ever built. Then, when they invent an antigravity machine, Major Monogram and Carl the intern decide it can only mean that the brothers are working for the evil Dr. Doofenschmirtz.
Subjects: Brothers, Juvenile fiction, Inventors, Fiction, Children's fiction, Airplanes, fiction, Adventure and adventurers, fiction, Picture books