The Magic Tree House Merlin Missions A Library of Books 1-27 Collection Boxed Set is a series of 25 books in English that are perfect for children in second to fifth grade. With historical, fantasy, and adventure topics, this collection is part of the Magic Tree House series by Mary Pope Osborne. The books feature engaging stories, illustrations, and are ideal for parents and teachers using the Core Curriculum. Each book in the set follows Jack and Annie on adventures through the magic tree house, making it a captivating and educational read for young readers.