Magic Tree House Research Guides are now Magic Tree House Fact Trackers! Track the facts with Jack and Annie! When Jack and Annie got back from their adventure in Magic Tree House #43: Leprechaun in Late Winter, they had lots of questions. What are leprechauns? How do we know many of the old Irish stories? How do fairies spend their time? Who speaks the Irish language? Find out the answers to these questions and more as Jack and Annie track the facts. Filled with up-to-date information, photos, illustrations, and fun tidbits from Jack and Annie, the Magic Tree House Fact Trackers are the perfect way for kids to find out more about the topics they discovered in their favorite Magic Tree House adventures.