Mysteries of Equestria: Round 2

Comment with which mystery below!
The story will continue, but what shall the investigation team do next? Which mystery warrants their attention? You decide!

First: fav.me/d5koy83
Previous: fav.me/d6eroed
Most Recent: here
Next: coming
Gallery: lightningtumble.deviantart.com…

More inbound! And by that I mean eventually I’ll do more.

Vectors used/modified for this:
-Canterlot street scene: fav.me/d51963y
-Smug Rainbow Dash: fav.me/d6f9m9m
-Twilight Sparkle…Confused: fav.me/d5vu4ik
-Others by me

If you see any grammar issues (and I’m sure there are some) please send me a note pointing them out and I’ll be super grateful! If you see any other problems please tell me and I'll hopefully be able to improve!