In the small Highland village of Cronchie, a wealthy family are found brutally murdered in a satanic ritual and their heirloom, 'the devil stone', is the only thing stolen. The key suspects are known satanists - case closed? But when the investigating officer disappears after leaving the crime scene, DCI Christine Caplan is pulled in to investigate from Glasgow in a case that could restore her reputation. Caplan knows she is being punished for a minor...