Pinkie's life is a normal one... At least, as normal as it could be for a Party Pony. But lately, she has been noticing... things... Strange things that are hard to explain. Ponies that don't seem to be there when she looks directly at them, buildings that were there just yesterday, but don't exist today. And then Princess Luna makes a startling revelation to the Pink mare that explains- as well as shatters- everything that she knows about the world.