Captain Shining Armor and Captain Moonwhisper. There are many similarities between the two stallions. Both are among the most powerful of the unicorns in Equestria's Royal Guard. Both are romantically tied to an alicorn princess. And, strangely, both were completely absent during the Storm King's invasion of Canterlot. In Equestria's hour of need, where had these stallions gone?

The answer, as it turns out, involves a friendship mission in a remote corner of the Equestrian wastes.