As a political crisis with the newly allied Changeling Kingdom escalates, a killer virus outbreak threatens the capitol city as Twilight Sparkle and her new partner Seymour try to resolve the conflict.

Fear changes everything when new-in-town honor's student Amber Simmens, her young brother, friends, and Officer Seymour Reiley are cornered in the Maine city of Bridgton by a supernatural, all-consuming mist filled with bloodthirsty creatures.