You can't read, can't write, but you heal fast, even for a witch. You get sick if you stay indoors after dark. You hate White Witches but love Annalise, who is one. You've been kept in a cage since you were fourteen. All you've got to do is escape and find Mercury, the Black Witch who eats boys. And do that before you...
Two rival faery queens both want sixteen-year-old Nora for their own. The cost of their attention could very well be her death. The only way out of their twisted game is to solve a complicated riddle where the answer is the key to survival.