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To keep her mind off Almanzo's extended absence, Laura pitches in with Mary and Adam's new blind school in Sleepy Eye. Back in Walnut Grove, Nellie struggles with her feelings for Percival.
Almanzo finally proposes, to Laura but Charles insists that they wait two years. Harriet Oleson wants Nellie to be trained to to take over the restaurant, but the hiring of Percival Dalton creates more drama.
When a school in a nearby town is in need of a temporary substitute, 15-year-old Laura finally gets her start as an teacher. For the first time, Almanzo seems to notice that she is growing up.
Fed up with his overbearing wife and his lack of authority over the children, Nels packs up and heads out for an indefinite period of time. While running a mobile mercantile of his own, he stays at a boarding house owned by Molly Reardon, a beautiful Irish woman who shows him the respect and appreciation that he's never had at home.moreless
Almanzo and Eliza Jane get a visit from their kid brother Perley Day, but after a few days with him, they quickly remember why the boy has been so estranged from the family over the years.
Disaster ensues when Albert and a friend smoke a pipe in the basement of the blind school.
Eager to sharpen her teaching skills and seem more grown-up, Laura volunteers to tutor a deaf teenager named Daniel,.
Charles and Caroline take a trip to Milwaukee for a school reunion. Although they are excited to mingle with old friends, they are disappointed to learn what has really become of their former classmates.
A school bully causes so much trouble that Miss Wilder decides to resign. Laura and Albert take it on themselves to intervene.
A boy abused by his alcoholic father is now an angry teenager. Arriving in Walnut Grove, his grandparents find they can no longer handle him, and invoke Charles' help.
A telephone line is set up in Walnut Grove. With Harriet Oleson in charge of the switchboard, calamity ensues.
When Mary's pregnancy is announced, Caroline's parents arrange a visit to witness the birth of their great-grandchild. Unfortunately, when her mother dies en route, Caroline is left to deal with her father Frederick, whose world now feels empty and meaningless.
Reverend Edward Danford, a preacher who works as a "faith healer," holds meetings in Walnut Grove.
Isaiah Edwards narrowly saves his daughter Alicia from a falling tree, but is seriously injured in the process. His immobility sends him spiraling into depression.
Laura and Albert are excited to dress up as Indians for Nellie Oleson's Halloween party. Caroline insists they take a nap first, which leads to Albert having an extended nightmare.
Reverend Alden begins spending time with a single woman his age. Their budding relationship is threatened by gossip from Harriet.
Nels Oleson is humiliated when he sees his estranged sister Annabelle as "the fat lady" in a traveling circus that comes to Walnut Grove. Meanwhile, Laura is unhappy when Almanzo begins dating a rude young woman named Christy.
When Adam wins a prestigious teaching award, he and Mary travel by stage to accept the honor.
Albert struggles with his identity when Miss Wilder assigns the students a family tree project. To complicate matters, his biological father shows up.
Laura decides that becoming a teacher will convince everyone of her maturity, but first she must pass the graduation exam.
As the new school year begins, Nellie receives a surprising graduation present from her mother. Caroline gets a job when Charles is injured and unable to work. A new teacher arrives in Walnut Grove with a handsome younger brother who catches Laura's eye.