Sunset Shimmer's life is surrounded by mysteries. They are her job, and her personal life is riddled with them. She works with Rarity as PIs at their very own Shimmering Diamond Detective Agency, and missing person cases are their second most common commission, just behind cheating spouse/whatever. Coming into the office one day, Rarity sticks Sunset with another one of these, but this turns out to be more than a simple disappearance. As answers are revealed, more questions arise, and Sunset has to wonder, what or who's trying to kill her?
Is this a crossover?
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Nope, I was thinking about fanfic ideas for another show I like when I thought of this and realized it would make a good MLPEQG horror fic.