Naerie, a former princess now in shackles and paraded like an object at the human kings parties. Her people are dead, her land stolen from beneath her feet. But something changes in this king. A powerful man named Namjoon crashes the kings latest party with a simple threat and the king responds with something unusual. He sends Naerie away. The Underground is an illegal fighting pit run by the king himself. The elite visit every so many nights to bid on brutal fights to the death. And 

In a world of carefully kept balance, the powerful clans of shape shifters and other fae hide from the world of humans while glorying in the limelight. What will happen to the passingly civil relations however, when a powerful new clan appears?