The assassination of the Chief Judge has pushed the Capitol to the edge. The Great Extermination has spread to all the land. The casteless must be annihilated.

Their only hope is the fallen Protector Ashok Vadal. But Vadal is being held prisoner on the island of Fortress. In order to save those who need him most, he must escape and find his way across the demon-infested sea and return to Thera, the prophet of an illegal and forgotten god. It is she who has sent the Sons of the Black Sword to war against the warrior caste, hoping to buy time until Vadal's return.

But as the chaos swirls, Grand Inquisitor Omand Vokkan launches a coup to install Lord Protector Devedas as his puppet king. Devedas has no intention of being anyone's puppet, but it may not matter. For Vokkan has struck a secret bargain with a demon. Vokkan will destroy the casteless for this ancient being; in exchange, he will be granted the power of the ancient gods.

Ashok Vadal, Thera, and the Sons of the Black Sword face foes both human and supernatural, Byzantine political intrigue and bloody hand-to-hand combat, gods and demons alike. But Vadal is a warrior with a warrior's heart, and woe to those who would stand in his way--man, god, demon, or otherwise!