On a hot day in June, two groups of campers disappear in the Green Swamps of Florida. The wood is still burning in the bonfire, all their belongings are abandoned, and there is blood at the campground. But not a single body is found. Patty McGee, grandmother to one of the missing campers, sets out to find out what happened to her grandson, thinking his father might have kidnapped him. But soon she realizes she is up against a force way more powerful then that. It's a battle even she can't win.