the doors grew more rare as time passed and now, only three Antari are known in recent memory-Kell Maresh of Red London, Delilah Bard of Grey London, and Holland Vosijk, of White London. But barely a glimpse of them have been seen in the last seven years-and a new Antari named Kosika has appeared in White London, taking the throne in Holland's absence. The young queen is willing to feed her city with blood, including her own-but her growing religious fervor has the potential to drown it instead. And back in Red London, King Rhy Maresh is threatened by a rising rebellion, one determined to correct the balance of power by razing the throne entirely. These two royals from very different empires now face very similar struggles: how to keep their crowns-and their own heads. Amidst this tapestry of old friends and new enemies, a girl with an unusual magical ability comes into possession of a device that could change the fate of all four worlds. Her name is Tes, and she's the only one who can bring them together-or unravel it all.