The bestselling, fan-favorite chapter-book series celebrates Halloween with this scarily affordable paperback! Jack and Annie have traveled all over the world in their magic tree house. But they've never been anywhere like this. In the distance, a haunted castle looms dark against the light of the moon. No candles burn in its windows. No laughter rings through its halls. What has happened to the castle and the people who lived there? Merlin the magician asks Jack and Annie to find out. But are they brave enough to brush the cobwebs aside and step through the creaking doors? And are they smart enough to solve the mystery of how the castle became haunted? Find out in a story packed to the margins with magic, history, and adventure! First published in hardcover in 2003, Jack and Annie's spooky Halloween adventure is finally available in paperback. And--only in the paperback edition--the book now includes a creepy Halloween recipe, a fun puzzle, and a preview of the next book in the series! Magic Tree House books are ''New York Times'' bestsellers. They are known all around the world as books that inspire reading. Find out why with ''Haunted Castle on Hallows Eve! ''And don't forget to visit www.magictreehouse.com.