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This film was one of Mary Pickford's attempts to add at least a touch of maturity to her little girl characterizations. She is a Kentucky mountain girl in this romantic adventure film, and Harold Goodwin is the boy who befriends her. Sam DeGrasse was the villain. Future silent-screen idol Jack Gilbert also had a small role. While Heart O' the Hills received politely positive reviews and some interest surrounded Pickford's more mature role (the character was teen-aged; Mary herself was 27), there were no real raves. After this, Pickford firmly returned to the security of her more youthful portrayals -- her next film was Pollyanna.