The Magic Tree House Series by Mary Pope Osborne is a complete set of 49 books that are sealed and brand new. This fiction series, published by Scholastic in the 1990s, is intended for ages 9-12 and features illustrated paperback books with 96 pages each. The narrative takes readers on magical adventures through time and space, following the adventures of a young boy and his grown-up as they discover new civilizations and cultures. Written in English, this series is a part of the Enlightenment literary movement, making it a captivating read for young readers.