Sunset Shimmer has lived in the human world for over ten years now. Some of the best and worst days of her life have happened there. When she finds herself no longer having a place in the world she's grown accustomed to she travels back to her homeland of Equestria to figure out who she is and where she belongs. What she finds is a land and people irreversibly changed by time.

Twilight Sparkle now rules over this new Equestria. It is a time of peace and prosperity for the entire world, so why does the Princess seem so sad?
Figuring out her own problems, an entirely different home than the one she grew up in, and her increasingly complicated relationship with Princess Twilight could be the most difficult thing Sunset Shimmer has ever done.
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Story takes place post FIM and EG

In the quest to save the two weakening alicorns, Twilight and Sunset will travel across Equestria and even into the Princesses' past to get the answers they need.

Everyone will have to fight to save their home as they know it from creatures of darkness that are growing ever stronger and will try anything to stop Luna and Celestia from reawakening.