High in the Swiss Alps, Heidi, a five-year-old orphan, comes to live with her grandfather. His neighbors say he is a fierce old hermit of whom they are all afraid. Heidi, however, proves to be a remarkable, unaffected child, who quickly charms her grandfather. In fact, for Heidi, nothing could be better than living with him. She has a genuine enthusiasm for life in the mountains: for the goats, which she helps Peter to tend, the spring flowers on the Alm, and the simple hay bed that she occupies in the loft.
However, her Aunt Dete doesn't understand, and it is a sad day when she takes Heidi to live in a strange city with a strange family who want a companion for their young invalid daughter named Klara. Heidi does her best to be a friend to Klara, but her longing for home becomes too much to bear.