The Knight at Dawn (Magic Tree House, No. 2)

That's what Jack and Annie find when the Magic Tree House whisks them back to the Middle Ages for another wild adventure. In the Great Hall of the castle, a feast is under way. But Jack and Annie aren't exactly welcome guests!
Mary Pope Osborne is the author of the popular Magic Tree House series. She works with her husband Will and her sister Natalie on the nonfiction companion series, Magic Tree House Research Guides. Many of her books have been named to best-books lists.