MARY POPE OSBORNE is the New York Times bestselling author of the Magic Tree House series. She and her husband, Will Osborne (creator of Magic Tree House: The Musical), live with their three dogs in northeastern Connecticut. Osborne, Will, and her sister, Natalie Pope Boyce, are also coauthors of the Magic Tree House Fact Trackers series. SAL MURDOCCA has illustrated almost 200 children's books, both fiction and nonfiction. He's also a children's opera librettist, a video artist, a runner, hiker, and bicycle, and a children's illustration teacher at Parsons School of Design. Sal and his wife, Nancy, live and work in New York.