Christine Boylan 
Prism of Midnight Dawn, Volume 1 [PDF ebook] 

A year has passed since Princess Ai returned to troubled and war-torn Ai-Land, flanked by the now-loyal Furies. Ai led the Second Revolution to a successful conclusion and took the throne of Ai-Land, co-ruling with her half-brother, the radical Angel leader, Nora. But all is not well in paradise, as Ai struggles with loneliness, isolation, and the pressures of rule. And back on The Other Side, things are not as they should be, either. Mysterious forces have gathered and threaten to push both worlds to the brink of destruction…