Following the events of the Storm King's invasion of Canterlot, peace returns to Equestria. Apologetic and disheartened from their failed offense, all of the shattered king's servants and soldiers collect themselves, pack their things up and return to their homeland from whence they came.

All except one.

The unicorn mare, who formerly called herself commander of the Storm King's army, decides to stay with the people she had once abandoned so very long ago. And with this decision, she finds not only forgiveness, friendship and long-lost belonging, but something more. And that something lays in someone who not only showed her all these things, but forever changed her life for the better.

However, just as the dust begins to settle, it seems as though a tremendous, if subtle problem starts to loom over Canterlot no sooner than had it averted disaster...