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 #46: Dogs in the Dead of Night, " they had lots of questions. How do St. Bernards help find avalanche survivors? Who are some of the most famous war dog heroes? What breeds make good service dogs? 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.