I just saw this hauntingly beautiful film last night on AMC. It's subtle beauty requires viewers' attention and participation. Do not watch it if you're in the mood for an easy escape film. To appreciate it you must be sensitive to facial expression and non-verbal signal. It also helps to understand a little about the culture of the South.
It works on two levels, at least:
First, it tells the story of a wife's dawning understanding of the hopelessness of her marriage and her resolve to have a good life anyway.
Second, it shows the tragedy of severe child abuse in great depth and reveals the community's culpability. I've never seen a more powerful visual metaphor than Henry's escape attempt, where camera facing him head-on, he runs furiously, climbing and clinging and failing to make it onto the back of a speeding truck.
The film juxtaposes Henry's relationship to his adopted mother to the relationship of his wife to their daughter. This loving, beautiful relationship is the pivot around which the story revolves. Henry, dull, unintelligent, abused Henry is lost, but in one area he had supreme luck (or supreme judgment). His child has what he never had, and will grow up beautifully. He could not have chosen a better mother for his daughter.
The screenplay, acting and direction are all superb.