For Ringan and Penny, it’s a mixed blessing. The couple has already held two terrifying exorcisms for ghosts whose stories are told in songs, and Callowen House is known to be haunted by the pretty young wife of a seventeenth-century Leight-Arnold. A famous traditional song, “Matty Groves,” tells her story, a straightforward one that Miles Leight-Arnold is very proud of. Ringan and Penny decide to attend; after all, this story has no mystery for them to solve. But from the first night it becomes clear that the tragic Lady Susanna is not the only spirit haunting Callowen House. Something else is awake, moving through walls and nightmares, growing stronger as it feeds on Penn’s sensitivity and on the very fear it creates: Andrew Leight, a man as twisted and violent in death as he was in life. Lord Callowen insists that Ringan and Penny rid Callowen House of the dangerous Leight but leave Lady Susanna’s ghost untouched.