Elmer witnesses his wife, Ferris, cheating on him with her colleague, Monroe, at a Christmas party. He is overcome with rage and resolves to kill the man. When Monroe asks Elmer to take him camping, Elmer agrees, knowing it will be the ideal time to follow through with his plan. They make it to the countryside and head to a stream to go fishing, but stumble upon a hole in the ground and head back to camp, startled by the found grave. That evening, Monroe confronts Elmer, saying that he must have dug the grave planning to kill him. Monroe then uses a rock to kill Elmer and buries his body in the grave. Elmer awakens from his death-slumber and emerges from the grave, uncertain of how he arose from the ground or how long he has been there. He makes his way through the woods, killing three hunters before moving into town and causing chaos and destruction there. He finally arrives at his home, and enters the pool house where he knows Ferris will be, swimming laps. Ferris is not scared of her fresh-from-the-grave, demon of death husband. She floats on her back in the pool, calmly reiterating to him that she never slept with Monroe, who has fled to Mexico to avoid criminal charges for Elmer's disappearance in the Alaskan bush on the fateful hunting trip. She references a time when Elmer came home drunk and raped her. Although he does not remember the incident she brings up, he does remember the first time he visited her parents house and left a bruise on her eye during a fight. He looks back on his childhood and the origins of the supernatural darkness that has overcome him, resurrecting him from the grave, complete with a transfiguration into an agent of chaos and death. Ever since he was young, he has had supernatural abilities: premonitions of people's' deaths, visions of the dark underworld lying just under the surface of reality, and telekinetic power. His wife's confrontation of his violent actions only upsets Elmer more and he dives into the pool after her. They fall into the water, surrounded by an air bubble. Ferris draws a pistol given to her by Monroe and aims it at Elmer, who lunges for the gun. A dark halo appears in the pool, and Elmer falls into a nightmare that opens into daylight. It is his wedding day, and they are cutting the cake. Ferris opens her mouth to eat the cake, and Elmer is aware that she is also biting into his soul, forever more powerful than he is. He is overcome by his wife, a supernatural being of terror herself too now. A little girl in a funeral dress sings a worm song from his childhood as he is consumed into darkness.