In 1974 Oxford, an unorthodox professor named Joseph Coupland gathers a small team of students to conduct an experiment aimed at creating a poltergeist. The experiment centers on Jane Harper, a deeply troubled young woman who is believed to harbor powerful paranormal abilities. The team tries to uncover the dark secrets buried in Jane's subconscious, using methods that defy conventional scientific principles. As they delve deeper into her psyche, unexplained and malevolent occurrences start to take place, fostering an atmosphere of escalating tension and fear.

Brian McNeil, a cameraman documenting the experiment, begins to question the ethical boundaries of their research and Coupland's relentless methods. The boundary between scientific investigation and supernatural danger blurs as Jane's condition grows increasingly unstable. Confronted by a series of terrifying and inexplicable events, the group finds themselves in peril far beyond what they anticipated. Struggling to maintain both their scientific integrity and their sanity, they are drawn into a web of mystery that challenges their understanding of reality.