For a mermaid novel this is quite a ghost story. When you pick up a YA novel about a love between a human and a mermaid you expect something a bit twee, but this is a brutal story with some real gut wrenching scenes of violence and sacrifice. I hesitate to describe much of the plot because I knew nothing about the story when I started it and enjoyed the unexpected turns. Enough to say it is about a young woman who works as a pilgrim reenactor in Plymouth and literally lives half her life in a world of ghosts.
I listened to the audio of this because I heard the narrator perform a selection from it a library conference a few years back. Katherine Kellgren does an amazing job on this performance and I highly recommend the audio version.