A legendary Skinner has passed. Among the articles he left behind are runes, potions, and powerful weapons to aid in the ongoing war against the unspeakable creatures that prowl the shadows outside normal human consciousness. But there is something else: the remains of a terrifying beast no other Skinner has ever encountered. And it isn't dead.

Skinners, partners, lovers, Cole Warnecki and Paige Strobel are well armed with the tools the late Jonah Lancroft provided. But even his best weapons may not be enough to defeat the monstrosity they now face. A new terror has risen up to infect them both with its virulent malevolence, even as Paige confronts the secrets of her astonishing past. The purest evil walks the world again—the First Deceiver, humankind's darkest nightmare, the self-proclaimed King of the Full Bloods.