I bought this under the mistaken impression it was the first in the series. Anyway...
Rose hears a woman scream while she is out painting at the site of a former mill. She calls the police, but they can find nothing of concern. Then, a few days later, the former girlfriend of the man Rose is sort of dating goes missing.
I wanted to love this series - I love Cornwall. However, I found this novel slightly dated; I have described Jenny, the woman who goes missing, as Nick's girlfriend, but in the novel, she hopes to become his mistress, despite the fact neither are married. There is a lot of description/telling and far less dialogue/showing. I quite liked Rose, although the number of male admirers she seemed to attract was mystifying (but helpful to the plot).
I also found the plot very lacking in urgency or pace. The "whodunnit" is revealed at the end, in an encounter months after the event and was extremely underwhelming. Disappointing.