Prisoner. Pupil. Puppet. Which one am I? Maybe all three. All I wanted was to keep my head down, avoid the fae nobles who sneer at my half-human blood, and spend time with the few friends who don't care about my heritage. Then the notorious Night Vipers killed one of those precious friends. I'm determined to make the assassins pay, but my plans for revenge backfired, and now I have a choice. Trust Raven, the fae noble who wants something I'm not sure I can give, who has more magic in one feather of his midnight wings than I possess in my entire body, and who promised to help with my revenge. Trust Ash, the steely-eyed master assassin who spared my life, who demanded I become his student in the art of death, and who seems to hate me even as he protects me. Or confront the mysterious deadly being that lurks at the heart of the assassins' power, the infamous Thief of Souls. We are all puppets dancing to its malevolent tune, but when the music stops, who will be left standing and whose strings will be cut forever?