Unsolved mysteries by day and reoccurring dreams by night plague the mind of Sunset Shimmer. On top of everything, her friends bonds are being broken, and her own magic is being pulled back into Equestria, as a threat from the Sirens looms on the horizon. Sunset struggles to put the puzzle pieces in place, and understand why the past is threatening the present, and how Fluttershy fits in to the strange events.