A chance encounter leads teenaged Margaret into the circle of Isobel Gowdie, a "cunning woman" who practices magic and travels in the fairy world. But Scotland is aflame with wars over religion and "correct" belief-English against Scots, Catholics against Protestants-and in the Scottish Highlands, the witch craze is at its height. When Margaret starts to meet with Isobel to learn magic, Isobel is accused of witchcraft, and Margaret becomes a suspect,...