Isobel is an artistic prodigy with a dangerous set of clients: the sinister fair folk, immortal creatures who cannot bake bread or put a pen to paper without crumbling to dust. They crave human Craft with a terrible thirst, and Isobel's paintings are highly prized. But when she receives her first royal patron-Rook, the autumn prince-she makes a terrible mistake. She paints mortal sorrow in his eyes-a weakness that could cost him his life.