Far across the ocean from any land known to Equestria sits the volcanic island nation of Hearth. It's ponies live a good life benefited by advanced technologies and metal flying machines that can carry any pony or cargo across the island in an instant, and watched over by the ever caring Hearth's Core military air force.

Big changes are coming to Hearth soon, and even the ponies responsible may have to change their plans when a routine flight gets lost in the fog and winds up over the magical land of Equestria. The sisters on board try to find a way home as they struggle first with survival, then life in a strange new land, then something none of them could have seen coming.

Note: Each chapter is told from a different point of view.