Jack and Annie have once again traveled back in time in their magic tree house, but they have a brand-new mission: to help bring happiness to millions of people.
Their mission takes them to eighteenth-century Austria, where they?re decked out in their craziest outfits yet?including a wig for Jack and a long dress with lots of ruffles and bows for Annie! But it will take more than the right clothing to help them fit in at a party at one of the most marvelous palaces in Europe . . . especially when all the animals in the palace zoo escape from their cages.
Can Jack and Annie save the day and complete their challenging mission? Find out in a story packed to the margins with history, mystery, and magic!