Jo Bhaer runs a school where difficult kids are not problems to fix. They are people worth understanding. Forty episodes of quiet observation follow Nan and the others through small failures and smaller victories, the kind that reshape you when you're young enough to still be becoming someone. The show trusts that patience is enough. There are no big dramatic reveals, no manufactured crises. Just a woman who refuses to give up on a child everyone else has already written off, and the slow accumulation of proof that she was right to try.

Jo and her kind husband, Fritz Bhaer, run a school at Plumfield. Nan Harding arrives as a new pupil, a tomboy whom nearly everyone finds a nuisance, though Jo sees her differently. Her classmates include Stuffy, who cannot resist sweets, Nat, a violin player, well-behaved Demi, Dan, a solitary drifter, and Tommy, Nan's rival. Between lessons the children have adventures and mishaps of their own and sometimes get things wrong, but Jo always stands up for them.