Brother and sister George and Margie Jansen - being the only living relatives of their estranged Great Uncle Christian - have inherited his home in the Florida marshlands, as well as all of his belongings. Along with the estate comes an old groundskeeper named Benjamin. George and Margie travel to Florida together from their homes in Seattle to sort through all of their great uncle's things and decide what to do about the estate. The property is beautiful but strange, with Benjamin only adding to the eerie atmosphere. As they spend more time there, they learn more about the house's history: that people tended to stay away from it, and there were whispers among the older residents of murder in the marsh. A sense of unease settles over the property. Margie swears she hears something stalking around outside in the night, and Benjamin warns that the marsh is not safe. It seems that their presence has awakened something that had been dormant. Benjamin claims he can sense it... and that it wants to consume them all.