Get ready for a world of adventure with the first four titles in the beloved Magic Tree House series!Jack and his little sister Annie are just two regular kids from Frog Creek, Pennsylvania. Then they discover a mysterious tree house packed with all sorts of books...and their lives are never the same! Soon they are traveling through time and space in the magic tree house and having amazing adventures. Whether it's watching baby dinosaurs hatch, finding a secret passage in a castle, helping a ghost queen in an Egyptian pyramid, or finding pirate treasure readers won't want to miss a single story!