June and Day are on the brink of triumph. Their efforts have brought into existence a new Republic of freedom and equality. June is Princeps-Elect, and Day is in one of the highest positions the military can offer. The carpet is yanked from their feet when a deadly plague breaks out, the fear of which threatens to plunge the nation back into chaos. To stop it, June and Day may have to give up everything they have worked for--even each other.

Seventeen-year-olds Kaede and Taisin are called to go on a dangerous and unprecedented journey to Tanlili, the city of the Fairy Queen, in an effort to restore the balance of nature in the human world.