Laura's beloved horse, Bunny, has officially been returned to her. She eagerly prepares to enter a local race. Jealous, Nellie throws a tantrum until Harriet agrees to buy her a thoroughbred -- without Nels' approval. Although Nellie and her horse are expected to win the race, Laura perseveres with her training. The stakes are higher than ever when Harriet donates a lavish prize for the winner.