17-year-old Niamh exists on the boundaries between worlds. Traded away to the Undine Maureen by her biological mother, she's spent her life doing the Seelie Court's dirty work in exchange for glyphs, symbols that grant her powers. Now, with war coming to Faerie, she will question everything she's ever known. She must decide where her loyalties lie and learn how far she will go to protect what matters.