Twelve-year-old Katy is constantly making and quickly breaking resolutions about how she will change her ways and treat others, especially her five younger brothers and sisters, with more respect and compassion. When Katy meets her Cousin Helen, an invalid, Katy is awed by her kindness, prettiness, and generosity. Katy is determined to become more like Helen, a resolution that lasts only a few hours. Soon, however, Katy gets a chance to become more like cousin Helen than she ever wished as she finds herself confined to her bedroom for four years as a result of an accident.