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Seven years ago, the voyage of the Atargatis ended in death, tragedy, and mystery. The ones left behind, watching the footage from their conference rooms and research labs, can only do thing to avenge the death: solve the mystery.

Are there really mermaids in the Mariana’s Trench?

Will they kill us?

The horror of the mermaids was very well done, and I was genuinely on the edge of the my seat reading this at certain parts. It did a good balance of physical, external horror of there being creatures hunting down the point-of-view characters while at the same time, there was excellent psychological horror of waiting for the monsters to find them, having death all around them, and trying to come to terms with their own actions in this crisis.

This an ensemble cast with a lot of characters that get their fair share of time to tell their story, history, and version of events. Tory is a scientist whose sister died on the Atargatis and is on this voyage to try to prove mermaids are real to bring some sense of justice and peace for her loss. Olivia is the personality in front of the camera to explain the science to viewers and investors back home. There is a wide range of more characters, but it would take too space to review all of them and I would rather focus on the sapphic content.

The romance between Tory and Olivia managed to feel engaging and heartwarming while in the shadow of the ongoing fear and horror of the situation. The book is realistic in that they aren’t going to have much time to grow close and intimate in the face of death. At the same, it is believable that the shock and grief of their shared experiences would bring them closer together.

The ending was not a huge bang, which I honestly appreciated. A lot of time in science fiction, horror, fantasy, etc. there’s this feeling that there needs to be a big, huge, bombastic climax that you would have in a Hollywood blockbuster. But I don’t think that’s always necessary for a book that’s in genre fiction. And here that works so well, because the book is so scientific and gets into the nitty-gritty details of the science that is being fictionalized. That scientific foundation went hand in hand with the more toned-down ending.

I enjoy horror about 50% and thankfully this book was part of the half of the genre I liked. The ensemble cast was big, but not too big that I couldn’t become invested in their individual arcs. The world building was magnificent, and the science was clearly well researched. I also love information about the ocean, so that was another fun part for me.

Overall, I highly recommend this book for any horror and science fiction fans.