In the eerie, fog-shrouded hours before dawn in Alabama's Mobile Bay, whispers of long-forgotten mysteries float on the breeze. Seasoned fishermen speak of elusive lanterns that flicker above the water, believed to be omens of danger. Old Willard, a veteran fisherman, once chased these lights and returned with a chilling tale and a scar to prove it. The lanterns are believed to be the restless spirits of lost sailors, and locals avoid the bay at night, fearing what it holds.

Claire, a young marine biologist, arrives in Mobile, determined to document the bay's ecosystem. Despite warnings, she dismisses the lanterns as folklore. As she delves deeper into her research, she uncovers disturbing stories of those who have disappeared in the bay, driven by the same fascination that captivates her.