When Jack and Annie receive an invitation to spend Christmas Eve in Camelot-a magical place that exists only in myth and fantasy-they know they are in for their biggest adventure yet. What they don't know is that the invitation will send them on a quest to save Camelot. Can they succeed even though Camelot's greatest knights have failed?Formerly numbered as Magic Tree House #29, the title of this book is now Magic Tree House Merlin Mission #1: Christmas in Camelot. The Merlin Missions books are more challenging adventures that will delight experienced readers who are fans of the original chapter book series!