Read the adventure and track the factsit's two great ebooks in one! Join Jack and Annie as they travel to the Middle Ages in Magic Tree House #2: The Knight at Dawn. Then uncover the facts behind the fiction in Magic Tree House Fact Tracker: Knights and Castles.It's two favorite ebooks in one!Find out why Mary Pope Osborne's #1 New York Times bestselling series is such a hit with kids, parents, and teachers around the world.