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.
As punishment for her crimes, the Elements have cursed Sunset Shimmer to do favors for anyone who asks. Lucky her. And then there's that other Twilight Sparkle she keeps running into...
Mystery. Love. Magic. Murder. Truth. These are all important elements in the murder mystery Fluttershy has written, and is now asking Twilight to read. But she struggles to solve the mystery in which it turns out she's the protagonist.
A sleeping Rarity mysteriously appears in her friends' beds, and nopony knows how or why. Her friends are determined to discover the truth behind Rarity's night-time snuggling spree.