Threads of Power #1 The Fragile Threads of Power(original) V.E. SchwabVictoria Schwab

Once, there were four worlds, nestled like pages in a book, each pulsing with fantastical power, and connected by a single city: London. Until the magic grew too fast, and forced the worlds to seal the doors between them in a desperate gamble to protect their own. The few magicians who could still open 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 them instead.