The inhabitants of Antonio Island, off the coast of Oregon, are about to unveil a statue honoring the four men (Castle, Wayne, Williams and Malone) who founded their town in 1871. Nick Castle is one of the descendants of the men, and owns a fishing charter company, using his vessel, the Seagrass, for tourism. When his girlfriend Elizabeth Williams returns to the island after spending six months in New York, a bizarre series of events begin to occur, including several gruesome deaths and the presence of a mysterious fog. When Elizabeth slips in Nick's boathouse and falls into the sea, she finds an old journal from 1871,