The City We Became (The Great Cities, #1)

Synopsis:

Five New Yorkers must band together to defend their city in the first book of a stunning new series by Hugo award-winning and New York Times bestselling author N. K. Jemisin.

Every city has a soul. Some are as ancient as myths, and others are as new and destructive as children. New York City? She's got five.

But every city also has a dark side. A roiling, ancient evil stirs beneath the earth, threatening to destroy the city and her five protectors unless they can come together and stop it once and for all.