When mysterious billionaire industrialist Morgan Hunter's son Bryant disappears from the megayacht Sirene under bizarre circumstances, the businessman organizes a search for the boy, spearheaded by ambitious journalist Kristin Ewell. Joined by marine biologist Ike Neumann, physicist Stephen Minter, and diver Duke Duquesne, the searchers embark on what is supposed to be a routine exploration of the ocean off Baja California, seeking the answer to Bryant's disappearance. But when incredible lights start to appear at night, and the truth behind Morgan Hunter's dangerous past is revealed, the search becomes anything but routine. Was Bryant's disappearance the only reason for the search? Who--or what--is causing those lights and the dazzling daylight displays? Who is Morgan Hunter, really? As the search grows ever more eerie and menacing, Kris, Ike, and the others realize there is much more beneath the waves than they ever imagined.