Book Description Jack and Annie are whisked all the way back to the Ice Age in this compelling Magic Tree House time-travel adventure where they meet woolly mammoths, cave people...and fierce sabertooth tigers! About Magic Tree House series Magic Tree House is a book series for young children by Mary Pope Osborne. The series features two children, the bookworm Jack and his adventurous and imaginative younger sister Annie, who travel to historical places using a magic tree house. The magic tree house belongs to Morgan Le Fay who, in the series, is King Arthur's sister and a librarian. She uses the magic tree house to gather books from time and space. Jack and Annie travel by opening a book, pointing at a picture of a place and then wishing that they could go there. The magic tree house then spins around and magically they arrive at the location. Book Dimension : length: (cm)19.4 　　　 　　　　　 　　　　　 width:(cm)13.1