Thestrals are thought extinct. But what will happen when one moves to Ponyville? Disguised as an earth pony, Acrylic does her best to fit in. Can she keep the secret, or will she expose her entire race?
When a newly-crowned Twilight Sparkle finds an old book hidden away in the royal archives, she discovers a piece of her mentor's past she had never been told about. And the more she read, the more questions arose. Just who was Sunset Shimmer?