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In the conclusion of a two-part story, Laura (Melissa Gilbert) tries to get over the departure of her fiancé, Almanzo (Dean Butler), by helping her sister Mary (Melissa Sue Anderson) and brother-in-law Adam (Linwood Boomer) set up a new school for the blind in the town of Sleepy Eye. As fate would have it, this is the same town where Almanzo has relocated -- and when she sees her beloved in a compromising situation with a saloon gal, Laura angrily breaks off her engagement. Things change dramatically when Laura discovers a remarkable secret about Almanzo while nursing him through an illness. And Laura's father, Charles (Michael Landon), is prompted to reconsider his insistence that the girl wait until she is 18 to get married. But what of the still-blossoming romance between Nellie Oleson (Alison Arngrim) and Percival Dalton (Steve Tracy)? This was the final episode of Little House on the Prairie's sixth season.