TumbleBookCloud TumbleBookCloud is a collection of videos and chapter books in categories which include: e-books, read-alongs, graphic novels, videos (from National Geographic), and audio books suitable for middle school and high school grades. The books feature adjustable text sizes, full narration, and a read-along function, which highlights text as it is read. These features make TumbleBookCloud a great tool for reluctant readers and ESL students. Plus, all these options can be switched to manual, so readers can read at their own pace. Also, teachers can take advantage of lesson plans and quizzes that accompany the books.