Just in terms of the premise, this is The Secret History meets Shadow Divers: a poor girl scuba diver falls in with a group of rich kid scuba divers, and they end up bound together by a shared deadly secret. There's other works it also reminded of, again just in terms of the premise, which are more spoilery: ( Read more... )

In the present timeline, Phoebe aka "Phibs," a poor aspiring underwater photographer, discovers a hidden underwater cave while on a diving trip with her four rich best friends, Gabriel (hot boy she likes), Will (Gabriel's fraternal twin, a joker), Lani (lost three fingers in past timeline, now afraid to dive), and Isabel (Lani's girlfriend). That is all the characterization Phibs's friends get, though Phibs herself gets a little bit more, or at least more backstory: she's the sole caretaker of her grandmother with dementia, and the women in her family have a possibly uncanny knack for finding things.

In the past timeline, Phibs finds five gold coins via the family knack, and something happens that led to Lani losing fingers and someone dying. In the present, Phibs finds a beautiful underwater cave with an air pocket. She and Gabriel rest and kiss in the air pocket... and then learn that there's a legend saying bad things happen to people who breathe the air in the cave. It seems to be true, as deeply creepy things begin happening to their bodies...

The plot and premise are great, and the diving and body horror/transformation scenes are really well-done. Reiss is a professional scuba diver, and you can tell. But the pacing feels a bit abrupt and choppy, which is not helped by the dual timelines cutting between the past and present, so that events that actually are set up still sometimes feel like they come out of the blue. I had a hard time figuring out the geography of anywhere that wasn't underwater, which is not a common complaint I have about books - for instance, I wasn't sure for most of the book whether the island base in the present storyline was a tiny island with only one house on it, or a large one with a town. And of course there's the mostly-nonexistent characterization, which is really the biggest problem with the book. If this had actual characters rather than "hot boy" and "Lani's girlfriend," it would have been so good.

I didn't mind that nothing is explained about what's actually up with the cave and Phibs's family knack, but in case you would mind: nothing is explained. I did enjoy reading the book but more attention to character and taking things slower could have made it excellent rather than just an enjoyable read with some standout elements.