Secluded in a desolate forest, a broken family is observed by Sator, a supernatural entity who is attempting to claim them.
Adam ives a lonely existence in a cabin in a desolate forest, checking Deer Cam feeds on his computer and occasionally receiving visits from his brother Pete. Another family member looms large in his life: his grandmother "Nani", who has long been a receptor for a spirit she calls Sator.—yusufpiskin
Nani, who suffers from dementia, believes a supernatural entity called Sator speaks to her in her mind and compels her to make automatic writings. Her daughter mysteriously vanishes. Nani's grandson Adam withdraws to a remote cabin to search for Sator, by exploring the surrounding woods with his dog and a hunting rifle, and by reviewing footage from a deer-cam installed near the cabin. Adam's sister Deborah tries to manage the family, Adam's brother Pete has a mental breakdown while with a friend named Evie, who loses her memory of the brothers following an accident.
Wearing fur and an animal skull mask, a disciple of Sator comes to Adam's cabin. She passes him a photograph, depicting several Sator disciples standing in a dark forest. Meanwhile, Adam's dog goes missing in the woods. While helping his brother look for the dog, Pete tells Adam that he thinks their grandfather Jim sacrificed himself to Sator, endorsed by Nani.
Adam finds Evie tied to a tree. He frees her, but feels suddenly compelled to choke her. Evie runs away and disappears into the sky.
Several Sator disciples visit Adam's cabin. He flees to a nearby cave and is drawn inside, where he becomes possessed encountering Sator.
Pete revisits Adam at the cabin. He sees Evie sitting silently in a chair. Adam stabs Pete in his throat and burns his face in the fireplace. Possessed now, Adam levitates.
Back at her house, Nani laughs when she sees Adam, whose head is now bald, standing in the hallway. Nani disappears and Deborah searches for her outside. Adam chokes Deborah, and Evie pours gasoline on Deborah as she and Adam burn her to death. Sator disciples gather around the fire.
Adam reenters the house, where he walks past a room where a bald woman sits silently with Adam's dog. Adam joins Nani in a different room where she sits with another Sator disciple. (thanks to Wikipedia)
