When her mom leaves her to live at the Ohio Institute, Natascha Darkfield learns that Shadowhunters, Warlocks, Faeries, and other fairy tale creatures are real- and that she is one of them. She discovers that the blue jewel she always wears around her neck can control, sicken, and even kill Shadowhunters; and is being suspected of breaking the Law. And worse: the enemies of the Shadowhunters will do anything to pry it out of her hands. Can she destroy the gem before it's used to kill everyone Natascha loves?