An urgent message from Merlin himself calls Jack and Annie to a Camelot in crisis! The magic tree house whisks them through time to find King Arthur gravely wounded and his legendary castle under attack. The kingdom's future hangs in the balance, and Jack and Annie are its only hope. They have just one day to solve a mysterious riddle, a puzzle that will lead them to a powerful, missing dragon. This isn't just any dragon; finding it is the key to saving King Arthur and restoring peace to the land. Join Jack and Annie on a thrilling, high-stakes adventure where bravery, quick thinking, and a touch of magic are essential. Can they unravel the secret of the ninth dragon and bring light back to Camelot before time runs out?