Sunset Shimmer's return to Equestria has her seeking to stop whatever it is causing her foster sister nightmares across the boundaries of two realities. But the challenges she faces will test her ability to handle the consequences of her past
Adagio wants power. Twilight and Sunset want to save everyone from her schemes. Sonata and Aria just want to get through another day. And poor Trixie just wants answers...
Sunset Shimmer returns to Equestria determined to save her home, but at such cost that destruction might be preferable. With Twilight imprisoned in the Labyrinth Box and the Mane Six captured the hopes of Equestria rest with the CMC.
Sunset Shimmer, purged of her inner evil by the Elements of Harmony, prematurely returns to Equestria. There, she is given the chance to learn the values of friendship first-hand.