Sixteen-year-old Olivia Prior is missing three things: a mother, a father, and a voice. One day she receives a letter from an uncle she's never met, summoning her to his estate. She discovers that her uncle is dead and the estate is almost empty. Olivia remains, but must follow two rules: don't go out after dusk, and always stay on the right side of a wall. It's hiding secrets of an ancient and magical realm, which calls to Olivia through her blood.