The Magic Tree House is an American series of children's books written by American author Mary Pope Osborne. The original American series is illustrated by Salvatore Murdocca, although other illustrators have been used for foreign-language editions.
The series consists of two groups. The first group consists of books 1-28, in which Morgan Le Fay sends Jack and Annie Smith, two normal children who are siblings from the fictional small town of Frog Creek, Pennsylvania, on numerous adventures and missions with a magical tree house. The second group, referred to as the Magic Tree House "Merl...