For Ringan and Penny, though, there's a downside: Callowen is haunted, by the pretty young wife of a 17th century Leight-Arnold, killed by her husband when she's caught in bed with another man. What's more, her story is told in a famous traditional song, "Matty Groves". And the couple has already held two terrifying exorcisms for ghosts whose stories, true or false, are told in songs.
This time, it seems, there's no mystery for them to solve; the Lady Susanna's story is straightforward, and besides, Miles Leight-Arnold is very proud of his family phantom.
A few suggestions for clarity, mainly reorganizing your sentences:
For Ringan and Penny, though, there's a downside. The couple has already held two terrifying exorcisms for ghosts whose stories, true or false, are told in songs. And Callowen is haunted, by the pretty young wife of a 17th century Leight-Arnold, killed by her husband when she's caught in bed with another man. What's more, her story is told in a famous traditional song, "Matty Groves".
This time, it seems there's no mystery for them to solve; the Lady Susanna's story is straightforward, and besides, Miles Leight-Arnold is very proud of his family phantom. But from the first night, it becomes clear that Lady Susanna, harmless and tragic, is not the only spectre.
Something else is awake, moving through walls and nightmares, growing stronger as it feeds on Penny's sensitivity and on the very fear it creates: Andrew Leight, a man as twisted and violent in life as he is in death. When Penny is attacked and Charlotte, the daughter of the house, is injured, Lord Callowen gives Ringan and Penny an ultimatum: get rid of Andrew Leight, but leave Lady Susanna's ghost untouched.
But I like Amy's suggestions even better.