Greatest among the demons was Kai Wren--the Godslayer and Lord Demon--a master swordsman, dreamer, and glassblower who can contain entire universes in bottles of his creation; a legendary warrior who once, long ago, singlehandedly destroyed a god. But now, Kai Wren must seek vengeance for the murder of his devoted human servant, and he fears that this one death heralds the crumbling of a peace that has reigned for a thousand years.

Forced into a series of uncomfortable alliances, Kai Wren strives to preserve the Demon Realms. But his heart has become his fatal weakness, growing soft during years of peace. He has given trust where trust should not be given, only to discover that among his closest companions are those who will betray him--even destroy him--unless he can regain that which once made him Lord Demon.