Dusk Crystal is a young unicorn living shortly after Luna is banished from Equestria to the moon. Equestria suffers from the still fresh wounds of the cataclysm. Dusk, a lonely student of Celestia, is sent to Tundragrov to learn about friendship. When she arrives at the city, she finds it under siege from inside and out as bitterness from old loyalties cause elements within the city to clash.