Time traveling from five thousand years in the future, Twilight Sparkle—or as she prefers, Glitter-Flanks—has one mission: to establish the closed time loop that sets her and Celestia up as a couple, by flirting as aggressively as possible.
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.
Celestia likes her routine. Tax reforms, grants, laws and construction projects are all a princess needs to be content. It's just her luck that for Pinkie Pie, "content" is not nearly enough.