Numerous Walnut Grove townsfolk become seriously ill after eating anthrax-laced mutton, turning the Blind School into a makeshift hospital and morgue. Charles and Jonathan – among the few who hadn't gotten sick – race against time to rush supplies and medicine to the Blind School, but have to encounter a few obstacles along the way. Namely, the brothers who sold the meat even though they knew it was spoiled; and a deluded farmer who believes the medicine will help him become rich.