seems interesting.

Wow, this is a well-written and interesting story. I do think you were too casual about the humans appearance in Equestria, that should've prompted some kind of national emergency. But you quickly move us past that and into the heart of the matter. A murderer. In Ponyville.

I like how you have the toughest and hardest of all ponies working the case, and how utterly lost they are. Whereas humans can track you from the touch of a finger on metal, the ponies literally do not know how to respond to it. Twilight's knowledge of humans and experience in combat is pretty extensive, but she has not been formally trained in combat. Shining Armor has, but he's not quite as good at tracking as Twilight is. Then, there's his responsibilities to the citizens and his sister. Poor guy.

I'm really liking this so far, and hope it gets updated soon. Twilight is getting in more and more danger the closer they get to the criminal. We all know that. I'm just waiting for the lights to go out and the blade to drop. Keep building that tension.

(Why hasn't the Princess come? Murder is a pretty damn serious business)

Don't know why you got so many dislikes. This story is amazing in its ability to portray the ponie's helplessness in dealing with pure cruelty, and setting up a good mystery feel. A plot twist with a murdered human? Brilliant. Keep writing man, and don't hurt Twilight. :)