Sixteen-year-old Isabelle 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 almost empty. It's hiding secrets of an ancient and magical realm, which calls to Isabelle through her blood... From the Sunday Times-bestselling author of 'The Invisible Life of Addie LaRue', and 'A Darker Shade of Magic'.