Heidi was orphaned at a very young age and her aunt Dete took care of her until she was 5 years old. At 8 years old, her aunt left her with her grandfather and Heidi was raised by her grandfather in the Swiss mountains. Together with her friend Pedro, a young goatherd, she takes care of her grandfather's goats and enjoys the freedom in the mountains. But one day her aunt Dete decides to return to take her to Frankfurt.