When one fateful search through the Everfree Forest leads Rarity to a secret library inhabited by the spirit of an ancient alicorn princess, she realises that it may be time to start believing in fairy tales.
Faced with Twilight's coronation, Rarity must contend with what it might mean for their relationship. After all, quietly stashed away in the back of her closet are dozens of books that aren’t hers. Someday, she hopes she'll be able to give them back.
Life is like a train ride, don't you think, dearest? Destinations will change, trains will be caught and missed, but there will always be somepony willing to journey with you—so long as you let them.
For Twilight, the increased lifespan that came with princesshood had forced her to outlive her friends, but thanks to Rarity, she will learn that centuries could be lived in but a single day.