Sparrow has no family other than the Thieves Guild, who found her orphaned and gave her a home and purpose. But the guild works to restore the Deathless Kings, godlike sorcerers who once ruled the world, and in Sparrow they believe they have found the key. Betrayed by those closest to her, she must turn to Raithe, an enigmatic assassin sent to kill her, to escape. But it is not only her fate at stake, but the fate of the world.