Born to wealth, Ada is destined to live a life of luxury—yet all she wants is freedom. A ghostly visitor and a series of seemingly supernatural events unexpectedly deliver her from the mundane—but no one could have predicted the darkness that comes with it. Taken in and raised by a secret society, she is groomed as an assassin. As Ada comes of age, she must become a predator, targeting members of the very nobility to which she was born. The only other choice is to leave the organization as a fugitive. And if she leaves, she must forsake the two people she loves more than herself: her captor and her adopted sister, both of whom would be slain as punishment for her disloyalty.