Book Description: JACK AND ANNIE continue their quest for the secrets of happinessâ€”secrets they need to save Merlin. This time, the Magic Tree House takes them to the one continent they havenâ€™t visited before: Antarctica! What can they hope to learn about happiness in such a barren place? Only the penguins know for sure . . . Jack and Annie are about to find out!From the Hardcover edition.