Merlin sends Jack and Annie on a mysterious mission to Paris, France, over a 100 years ago. There they must find four magicians and give them an urgent message from Merlin himself. When Jack and Annie land in Paris, they make their way to the 1889 World's Fair. Below the Eiffel Tower, built especially for the fair, there are thousands of exhibits from all over the world. But how will Jack and Annie find the magicians in the crowds of people? And who are the magicians anyway? Jack and Annie are about to find out in another adventure filled with history, magic, and amazing surprises!From the Hardcover edition.

JACK AND ANNIE continue their quest for the secrets of happiness--secrets they need to save Merlin. This time, the Magic Tree House takes them to the one continent they haven'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.

Magic Tree House is the #1 bestselling chapter book series! In their NEW adventure, Jack and Annie return to Camelot! In this thrilling adventure steeped in history, Mary Pope Osborne introduces readers to classic Welsh legends and continues her own story of King Arthur, Merlin, and the Knights of the Round Table. Have more fun with Jack and Annie on the Magic Tree House website at MagicTreeHouse.com!