On secret assignment from Princess Celestia herself, Twilight investigates a powerful magical artifact for clues to the mystery of Luna's transformation in the evil Nightmare Moon. Incautious use of the artifact sends Twilight hurtling back in time. Can Twilight discover what caused Luna's transformation? And will she ever make it home again?

Kickass cover art used with permission from Bitz.
http://allthebitz.tumblr.com/

Canterlot: The greatest city in Equestria. This is what many ponies will tell you... but there is more to Canterlot than meets the eye. Beneath the stunning and perfect cover, darker forces are at play. A string of murders throughout the city have caught the attention of a young detective mare whose highest priority in life is to put guilty ponies behind bars. But this case is more complicated than she expected, and only gets worse when she meets the grotesque pegasus stallion named Zombi. But is he friend... or foe?

Rated Teen for harsh language and gore.