On the Caribbean island of St. Marcelline, the date is July 16, 1816. Gaspard Fouche murders his wife and her male friend but, after a paperwork mix-up, Fouche is not charged with a double murder but with a misdemeanor and ordered to serve a mere 30 days. Gaspard thinks he is just lucky, but the luck turns dark when his low-life cellmate recognizes him as a murderer. Realizing that the cellmate might give him away, Gaspard murders the cellmate then finds a way to unlock the door of his cell just as the island's volcano begins to erupt. Aboard the luxury sailboat, “Fallstreak,” the date is also July 16, but the year is 2016. Vacationing charter Captain Jeff Tristy and Carrie Swain, his cook and budding romance, see a plume of dark smoke on the horizon and decide to investigate. Carrie thinks it's an island, but Jeff knows there are no islands anywhere near their position. What he does not know, however, is that there used to be. In 1816, a volcano on the island erupted with such force the island split apart and sank to the bottom. Now, a spiritual force brings back Gaspard Fouche's day in court, July 16, 1816, for an extraordinary reason: justice unrequited. Caribbean islands have been shrouded with whispered stories of witchcraft cults and supernatural lore, sometimes calling upon spirits to punish criminals who have somehow escaped the clutches of the criminal justice system. The captain and Fouche, who meet on the island, come to blows when Fouche believes Carrie is his wife reincarnated and tries to execute her with a guillotine. As the island's only volcano erupts again, splitting the island apart, Jeff rescues Carrie, subdues Fouche and throws him back into the same cell he escaped from earlier. Unable to open the door a second time, Fouche is consumed by a slithering stream of deadly lava intent on righting an aged wrong. Still curious about an island that seems to have no beginning, Carrie watches as the island begins its final journey to the bottom of the Caribbean Sea.