Anne of Green Gables , by Canadian author Lucy Maud Montgomery , is written for all ages but has been considered a children's novel since the mid-twentieth century.The adventures cover the life 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 the town of Avonlea on Prince Edward Island. We hear how she makes her way with the Cuthberts, in school, and within the town.Anne of Green Gables has sold more than 50 million copies and has been translated into at least 36 languages. The original book is taught to students around the world and has been adapted as films, musicals and plays.