I received a copy of this book through a Goodreads: First Reads giveaway.
Overall, this was a really interesting novel. I liked the concept very much, although the mystery part of it took awhile to get going. For example, the events previewed in the summary and on the back of the book don't happen until much later in the story. The main character, Cedar, runs a dive boat operation in Palau with her teenage son; she takes dive groups out to a reef where they have the opportunity to interact with and handle nautili. I didn't know much about the nautilus prior to reading this novel (I was really only familiar with the shell, not the creature that forms/lives inside it), and I learned a lot about it - in fact, I was inspired to Google them to see what the animal actually looks like. Cedar is a good mom who is also a multifaceted, intelligent woman with desires of her own. Her story is interspersed with another voice throughout the book, the voice of an ancient, sentient being who lives in the ocean.
Ken McAlpine clearly loves the ocean and its creatures, and that comes through in his writing. The sea creature gets a little preachy by the end of the book, but the intent of this novel is clear: to convince readers that we, as a species, need to take better care of the environment and the water that covers most of our planet. I think the reminder that we actually know very little about the things that live in the deeper parts of our oceans (including cephalopods - it's true, Google it!) is very timely and thought-provoking.
The writing is good, although there were a few minor editing errors. Also, I would have liked to have page numbers. I finished the book wanting to talk about it - I wasn't sure of the motivation behind some of the characters' actions toward the end of the novel. Definitely worth a read - would be good for a book club discussion.