After Ethan Hodges discovers an undersea cemetery just off the beach of Pelican Bay, South Carolina, he seeks answers from a grandfatherly fisherman named Captain Shelby. The captain wants the past to remain buried, and he warns Ethan to stay away. But Ethan doesn't listen.

Ethan's best friend and secret love interest, Morgan Olinsworth, joins in the investigation, unearthing intriguing secrets about the mysterious fisherman. When Captain Shelby is suspected of murder and disappears, a manhunt ensues, revealing a truth that unnerves everyone in Pelican Bay.