The first attack occurrs in the underwater caverns of the Bahamas. Two professional divers exploring the unknown. A monstrous flesh-ripping predator they never see coming.

Now the attacks are coming closer and closer to shore. A sun-soaked playground for sea-loving tourists. A human feasting ground for whatever lurks beneath.

Now, in a desperate race against time, Eric Watson, an expert on remote control underwater vehicles, and marine biologist Valerie Martell, must identify a savage new species of killer–and piece together one of nature’s most horrific mysteries. But the most terrifying discovery of all waits for Val and her team at the bottom of the sea. A discovery too shocking, to comprehend.