"Known as England's Nazareth, the medieval town of Little Walsingham is famous for religious apparitions. So when Ruth Galloway's druid friend Cathbad sees a woman in a white dress and a dark blue cloak standing alone in the local cemetery one night, he takes her as a vision of the Virgin Mary. But then a woman wrapped in blue cloth is found dead the next day, and Ruth's old friend Hilary, an Anglican priest, receives a series of hateful, threatening...