Pinkimena Diane Pie, a member of Princess Twilight Sparkles cabinet, is discovered to have committed horrible crimes, leading to a major shift in the world of Equestria, as copycats, inspired by the element of laughters deeds rise up, fear makes way for all forms of new crime, Equestrian police are not prepared for this level of crime, who will bring order to the nation. Inspired by MilesProwers story A Precious Rainbow among others. An alternate ending to the well-known Cupcakes.

The cover art is not my own... I found it with Google images.
Here is a link to the page its on https://www.deviantart.com/choyamy/art/Sad2-832388206