The King (2020)

Lee Warner lives in an isolated cabin within the mountains of Georgia. He enjoys his life by keeping a routine of structure and hobbies, but also endures a mental illness and a tragic past. Against his own belief, Warner's assigned nurse persists that his illness is worsening. One night, he sees an unspeakable horror inside his cabin. This pushes him to question his fragile reality and raise suspicions towards his nurse.