After Celestia shut down the spy agency EI:6, Agent Sweetie Drops assumed the identity of the candymaker "Bon-Bon" and moved on with her life. But when her marefriend is kidnapped, she uncovers a criminal conspiracy that might end that peaceful life.

(Book 1 of The Inheritors) 1,000 years ago, the villain Nightmare Winter defeated Equestria's princesses and conquered the land, bringing an endless winter. But the heirs of Celestia and Luna might have what it takes to stop her and save the world.