While Rarity was working on a new dress, a Pony ransacked her inspiration room and stolen only a Shadow Spade manuscript. Desperate to find the suspect before another pony reads it, she begins an investigation in Ponyville.
Coverart drawn by Sizi on Deviantart: https://www.deviantart.com/sirzi/art/Detective-Rarity-561515836
Written for The Whodunnit? Youdunnit! Contest, hosted by the wonderful RB_, which ends the night of October 24th (EST).
Aw! What a sweet story! Very pleasant reading.
The mystery was a little simple for my tastes. I don't particularly think you were going for anything elaborate, but just as advice, it's a good idea to include multiple possible suspects when writing a mystery like this. Otherwise, it can be pretty obvious whodunnit.
But overall this was very nice! Good job!