We all have secrets. Some secrets are meant to be hidden, and the ones meant to be hidden which are tried so hard to protect become told, otherwise the other pony might go, insane? Scootaloo has a secret. Rainbow Dash has killed many ponies. What would be her other friends reactions if they actually found out? Scootaloo and Rainbow Dash are the only ones who know the Secret behind the rainbows. But when Scootaloo can't keep the secret with Dash anymore, and she tells somepony, will Dash be able to explain herself?

After the murder of Rainbow Dash, her ghost feels as though she has not finished her business in the normal world. She seeks revenge on her so called friend Pinkie Pie, and to get her found out before more ponies are hurt.

BTW!

Art cover used from DeviantART user: aisu-isme. Credit to her! You should check out her gallery too.

P.S.
This has been edited with some new ideas.