Anne of Green Gables by L. M. Montgomery

A skinny, red-haired, and freckled orphan girl is mistakenly sent to live with a shy, elderly bachelor and his spinster sister on the north shore of Canada's Prince Edward Island; The elderly siblings had asked to adopt a young boy who could work on the family farm, but the imaginitive and rambunctious Anne Shirley arrives instead, and becomes the center of a series of entertaining adventures.