When Herne and Ember are approached by the matriarch of a group of water-horse shifters to help find her cousin's murderer, the Wild Hunt is drawn into a dark and shadowed world of the Ante-Fae.

But as the team delves into the details of the grisly death, they uncover evidence of a string of murders that leads them directly into the court of Blackthorn. Caught in a mire of political intrigue and shadow magic, will Ember and Herne be able to bring the serial killer to light, or will the King of Thorns manage to silence them forever?