Read the adventure and track the facts--it's two great ebooks in one! Join Jack and Annie as they travel to ancient Greece to meet Alexander the Great and his famous horse in Magic Tree HouseĀ® #49: Stallion by Starlight. Then uncover the facts behind the fiction in Magic Tree HouseĀ® Fact Tracker: Horse Heroes. 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.