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John-Boy's friend Sarah sees him as a way to escape her "trapped" life with her demanding mother. When John-Boy rejects her advances, she runs off and plans to elope with a townie.
Local blacksmith Curtis Norton has John-Boy write letters to his prospective bride. When she arrives on Walton's Mountain, life and Curtis are much different than she expected. Meanwhile, Olivia is feeling new pangs for freedom and something "different" in her life.
The entire family suffers a crisis when Olivia is stricken with polio. Dr. Vance prescribes the accepted treatment, but Olivia does not get better. John-Boy learns of a new treatment practiced by Sister Kenny and the family tries it to heal Olivia in time for the Easter service.