Faced with a guilt she cannot bear, Rainbow Dash runs far from home. And Applejack follows her. Applejack follows her through old forests and tall mountains, over blue seas and green plains, through freezing snow drifts and burning desert sands, past the borders of Equestria and into lands long forgotten, her every step more difficult than the last.

Meanwhile, Rainbow Dash desperately searches for a means of fixing her mistake, willing to do anything and go anywhere, no matter what she must sacrifice.

The story of two ponies, one on a journey of recovery, the other on a journey of redemption.