Charlotte is an influencer whose efforts to debunk supernatural legends catapulted her to internet stardom. Her next subject? Mary Hawthorne, a passenger aboard the S.S. Narragansett on the night it collided with another ship, caught fire, and sank off the coast of Mystic, Connecticut in 1880. Though locals claim that Mary continues to search for her young daughters, Charlotte remains skeptical. A mysterious locket and strange visions, however, transform her life into a living nightmare and force her to find the truth about Mary before she loses her grip on reality.