Yoto says: Explore ancient worlds with Jack and Annie in their Magic Tree House adventures! Jack and Annie are now Master Librarians. On their new set of amazing adventures they must find books in the early worlds of Pompeii, Imperial China, Dark Age Ireland, and classical Greece! Will they be able to recover the ancient stories they need in time? This pack includes: Vacation Under the Volcano Day of the Dragon King Viking Ships at Sunrise Hour of the Olympics