Earth pony, pegasus pony, unicorn; a human entering a Conversion Bureau will end up as one of these three pony forms. But there is a secret provision, to which all Bureaus must adhere utterly, should one unlikely but intolerable transformation somehow occur. The absolute monarch of Equestria fears nothing from the human world. Nothing save this.
Lillian Fogarty wanted only to be a simple pony in Equestria. Sought by the combined forces of Earth's corporate government and the might of Equestria itself she finds herself an abomination in both worlds, her survival almost certainly an impossibility.