The author's writing is delightful and engaging, and I never read it as a child so I am making up for lost time. It is written for children and those who love children. It is also one of the best-selling books of all time! I listened to the Blackstone Audiobook by Johanna Ward. It was excellent! Such a positive and uplifting book too. I needed that after reading The Great Gatsby!
The author was born in Switzerland in 1827 and the reflects the landscape from Spyri's childhood.
She does not look very happy in the picture below, but it is certainly a charming book.
Here is a tidbit though:
In April 2010 a professor, searching for children's illustrations, found a book written in 1830 by a German history teacher, Adam von Kamp, that Spyri may have used as a basis for Heidi. The 1830 story is titled Adelheide - das Mädchen von Alpengebirge—translated, "Adelheide, the girl from the Alps". The two stories share many similarities in plot line and imagery. Spyri biographer Regine Schindler said it was entirely possible that Spyri may have been familiar with the story as she grew up in a literate household with many books.