In 1558, while exiled by Queen Mary Tudor to a remote castle known as Perilous Gard, young Kate Sutton becomes involved in a series of mysterious events that lead her to an underground world peopled by Fairy Folkwhose customs are even older than the Druids and include human sacrifice.In 1558, while exiled by Queen Mary Tudor to a remote castle known as Perilous Gard, young Kate Sutton becomes involved in a series of mysterious events that lead her to an underground world peopled by Fairy Folkwhose customs are even older than the Druids and include human sacrifice.