The New York Times best-selling author of the "Newsflesh" series, Grant takes us deep into the Marianas Trench, where the Atargatis disappeared seven years previously while attempting to film a mockumentary about legendary sea creatures. Now a new mission is being launched, though with more high-minded intent. For scientist Victoria Stewart, in particular, it's a means of finding out what happened to the sister lost on the first voyage.

Seven years ago, the Atargatis sailed on a voyage to the Mariana Trench in the Pacific to film a mocumentary about the mythological mermaids said to live in the trench. Six weeks later, the ship was discovered adrift with no survivors. Now a new team sets out to seek answers. For young marine biologist Victoria Stewart, it is finally her chance to determine what happened to her sister on that previous doomed trip—and to avoid the same fate. VERDICT Grant's ("Newsflesh" series) skillfully crafted story combines science, horror, and mystery into a gripping novel of terror on the sea. Readers will never look at mermaids in the same way again. [Previewed in Marlene Harris's "Galaxy Quests" sf/fantasy preview, LJ 4/15/17.]—KC

There's some solid gore and nastiness in this sequel to Grant's novella Rolling in the Deep, but a mix of overwrought prose and questionable decisions prevent it from being much more than a 1990s horror throwback. Years after the ship Atargatis disappeared while attempting to film a fake mermaid documentary for Imagine Entertainment (a fictional company in the SyFy vein that inexplicably shares a name and nothing else with a real studio), the company finally decides to send another expedition, this time one with actual scientists. Key among the crew are marine biologist Victoria "Tory" Stewart, whose sister vanished on the Atargatis, and Dr. Jillian Toth, a sirenologist who considers herself a leading expert on mermaids. Grant's concept—mermaids as vicious creatures—is golden (and a late revelation about their biology is pretty nifty), but the prose gets bogged down in cliché ("She would show them all" appears, unironically, as a standalone paragraph) and long and meandering passages with little payoff. The neat hook and Grant's fan base will still prop the book up, but there's too little depth in these depths. (Nov.)