When the ancient Egyptian Water-Clock of Thoth disappears from his professor Dr. Hargrove's expedition, a former Egyptology student follows the trail to Matinicus Isle—the private estate of wealthy heiress Tess Conway. What begins as an investigation soon reveals that Tess used the Water-Clock's power for a dark ritual, with catastrophic results: the island's entire population has been transformed into restless ghosts, demons, and the undead. The opening cinematic depicts the estate as Boldt Castle, located on Heart Island in the Thousand Islands region of the Saint Lawrence River.