"Tell me something, if you can. What would you do if everypony you loved was suddenly taken away from you? Everypony that once provided you happiness and warmth and purpose, suddenly thrust from your grasp. Would you travel to the edge of the world for them? Beyond it? That's what I did. Because I needed to. Because there is nothing for me without them. Now you're going to tell me where they are, or I swear to the goddess I've lost that this will be twilight of my innocence."

When every last pony in Equestria save for Twilight inexplicably disappears overnight, a force from a parallel world is blamed. Now, the young mare plans to travel to this strange land in order to find what was lost to her, a world where a civilization of ponies thrives via the usage of not magic, but steam technology. With unexpected allies helping her from the shadows and light, Twilight will soon discover that things may not be as simple as they seem.