Anne of Green Gables is a novel by Canadian author Lucy Maud Montgomery . Written for all ages, it has been considered a children's novel since the mid-twentieth century. It recounts the adventures of Anne Shirley, an 11-year-old orphan girl who is mistakenly sent to Matthew and Marilla Cuthbert, a middle-aged brother and sister who had intended to adopt a boy to help them on their farm in Prince Edward Island. The novel recounts how Anne makes her way with the Cuthberts, in school, and within the town. Since its publication, Anne of Green Gables has sold more than 50 million copies and has been translated into 20 languages. Montgomery wrote numerous sequels, and since her death, another sequel has been published, as well as an authorized prequel. The original book is taught to students around the world. The book has been adapted as films, made-for-television movies, and animated and live-action television series. Musicals and plays have also been created, with productions annually in Canada since 1964 of the first musical production, which has toured in Canada, the United States, Europe, and Japan.