When a freak reading accident causes Twilight to be admitted to the Ponyville hospital, Rainbow Dash is right by her side. Compelled by a sense of duty and repayment, she takes it upon herself to cheer up her friend.

Princess Celestia tires of constantly being surrounded by decorum, deference, and formality, and decides to take a day off from being Princess. But visiting Ponyville incognito is harder than she expects. Will she be able to fit in and make friends without blowing her cover?

Twilight Sparkle just can't find enough time in the day. She has to study friendship for the Princess, hang out with her five friends, and juggle her own hobbies and interests besides. But when a novel solution presents itself in the form of an experimental new spell, will it solve her time crunch, or will she be distracted even further?

Throughout all of history, one concept has kept both the written and spoken word from becoming an unintelligible mess. That concept is that most holy of grounds known by some as "grammar." It sets down rules for language to follow, and keeps it free of distortion.

Yet something is wrong. The rules are failing. And only one pony so much as suspects that something is wrong. Something that goes deeper than a simple appearance of errors. Something that could be an attack on the very root of language itself.

We all wear a mask called composure, beneath which hides a heart that twists with guilt and hidden feelings. Regal as she is, Princess Celestia is no exception. What might be revealed should circumstances cause this mask to slip - or break?

Set several years after the potential conclusion to the series.