Princess Celestia has something important to tell Princess Cadance on the cusp of her marriage to Shining Armor, which is kind of too bad, considering.
For nearly every citizen of Equestria, it's a holiday: a chance to get together with friends, gather a few treats, and laugh in defiance of the darkness. For Celestia, Nightmare Night is something else entirely.
As she leaves for a diplomatic errand, Celestia is approached by her student, Sunset Shimmer, for a difficult, fateful discussion. Can she bridge the vast gulf that has grown between them?
For years, Twilight felt that something was off within her. With the emptiness more pronounced than ever, she decides to confide in Celestia. What the princess reveals, however, will test their relationship to its limits.
Princess Luna, struggling with the loss of the one closest to her, attempts to re-integrate into society after her return from her imprisonment on the moon. All the while, she fights to cope with a growing envy and burning hatred for her sister.
Celestia groomed Twilight to be the perfect student, the best leader, and her eternal partner in love. But why did she choose Twilight, of all ponies, to be her student? Unfortunately for her, Discord knows the answer all too well.