Heidi (Elsbeth Sigmund), a young orphan girl living with her aunt (Elsie Attenhofer) in Frankfurt, is forced to move to the Swiss Alps to live with her ornery grandfather (Heinrich Gretler). At first, he resents her presence, but, after a short while, Heidi manages to pierce his gruff exterior, and the two become close. She also befriends a young shepherd named Peter (Thomas Klameth). After three years, Heidi's aunt arrives and demands Heidi's return to Frankfurt.