Magic Tree House Merlin Missions: Eve of the Emperor Penguin

Jack and Annie are on a mission to learn the final secret of happiness! The magic tree house whisks them away to Antarctica, land of ice and snow and penguins. They’re supposed to find the Cave of the Ancient Crown. But when they meet a group of scientists and reporters, Jack and Annie discover that they are not in the past. How will they find an ancient crown in modern times?