Madame Katerina, Detective Nine Nails McGrays most trusted clairvoyant, hosts a seance for three of Edinburghs wealthiest families. n n The following morning everyone is found dead, with Madame Katerina being the only survivor. When questioned she alleges a tormented spirit killed the families for revenge. n n McGray, even though he believes her, must find a rational explanation that holds up in court, else Katerina will be sentenced to death. n n Inspector Ian Frey is summoned to help, which turns out to be difficult as he is still dealing with the loss of his uncle, and has developed a form of post-traumatic stress (not yet identified in the 19th century). n n This seems an impossible puzzle. Either something truly supernatural has occurred - or a fiendishly clever plot is covering a killers tracks... n