The Storm King never really died...but being reduced to a broken statue isn't most people's idea of living. The ponies of Equestria could bring him back to life if they wanted to...but only if they can convince him to behave. Good luck with that!
The Mane Six are joined by three others in a quest to use the Elements of Harmony one last time, as a brewing war between Tartarus and the free creatures of the world threatens to destroy Equestria forever.
A mysterious figure, living in shadows, is attacking seemingly random crime leaders and leaving little to no trace. The Mane Six investigate, but they find a secret more startling than what they had ever imagined.