When her younger sister Carmen, whom she has watched over since her parent's death, suddenly stops contacting her, Elisha fears something's happened to her. She travels to the stunning and luxurious island resort from where she last heard from her. Although evidence seems to indicate Carmen drowned during a snorkeling trip, Elisha is adamant her sister, an expert swimmer, is alive. After a near-death experience on the ocean, Elisha is determined to find the truth about her sister's disappearance, despite repeated warnings from a handsome tour company owner to quit her investigation and leave the island.