One year. It's been one year since a now reformed Diamond Tiara decided to become a better filly, but some things never change. Namely, yet another Hearth's Warming spent all by herself. Then, she hears a noise from the chimney....
Rainbow meets a talented, autistic patient, and has to spend the 12 Days of Hearth's Warming acting as her guardian after a slight 'misunderstanding', at least in her opinion.