Eve of the Emperor Penguin Author:Mary Pope Osborne Jack and Annie are on a mission tto learn the final secret of hapiness! This time, the magic treehouse whisks thrm away to the super-cold continent of Antartica - the land of ice and snow and penguins - where they're supposed to find the Cave of the Ancient Crown. But when they meet a group of scientists and reporters Jack and Annie are surprise... more »d to discover that they are in contemporary times! How will they find an ancient crown if they're with these poeople? Find out in.... Eve of The Emperor Penguin!« less