Merlin's beloved penguin, Penny, is under a spell! Jack and Annie must find four things to save her. The first is a rare and precious emerald. When Jack and Annie are whisked back to India over four hundred years ago, they discover an amazing and exotic world filled with danger. Can they find the emerald, avoid the wrath of the Great Mogul, escape an attack by king cobras - and make it back to the tree house alive?