Over 60 million years ago, an asteroid struck the earth, causing the extinction of the dinosaurs—almost all of them. A small group of small marine predators managed to escape and go into suspended animation. An earthquake awakens one of them, and after millions of years it’s hungry. Marine biologist Julia Hargety and her colleagues are on board an ocean research vessel when they receive a distress call from a small yacht—a call that is abruptly terminated. Obeying the rules of the sea, they go to the aid of the yacht, and find nothing but a deck awash in blood and a few scattered body parts. They report their findings but are at a loss as to what could have caused such devastation. Then, there are more unexplained deaths and Julia begins to realize that they are dealing with something that can’t be explained by science.