Book Description Illus. in black-and-white. Jack and Annie travel back in time to medieval England for an adventure inside a storybook castle， from feasting hall to dreadful dungeon. --This text refers to the Library Binding edition. Card catalog description Eight-year-old Jack and his younger sister Annie use the magic treehouse to travel back to the Middle Ages， where they explore a castle and are helped by a mysterious knight. --This text refers to the Paperback edition. See all Editorial Reviews