Princess Luna disappears from Equestria with hopes of saving the world and is accompanied by the enigmatic Sombra. Meanwhile, Celestia tries to bury secrets as immortal as she is and Cadance must choose her loyalties carefully...
Lately, Princess Cadance has been feeling inadequate. She's spoken of this briefly to Twilight Sparkle but her longing for a grand adventure is really starting to get to her as are the thoughts that she isn't doing all that she can.
Sombra is by no means an easy opponent. He is a manipulative wild card who has cheated death twice, and seeks to do so one more time. But, how many ponies can cheat death forever?
After recent events, Cadance is pretty sure that she doesn't want to go another adventure for a while. Except that you don't have to leave your castle to have an adventure. Especially if said castle is haunted.
Twilight Sparkle traverses the Arctic with Sombra as she tries to learn about the mystery that was Starswirl the Bearded's life. But are these secrets what she thought they would be? And just who was Starswirl anyway? Sombra seems to know, but why?