Convinced that poltergeists are nothing but trauma manifestation, a university professor pushes the boundaries of ethics when he experiments on a woman said to be possessed. However, he and his students soon come to discover they have entangled with something beyond their comprehension.
The film tells the story of an unorthodox professor (Jared Harris) who uses controversial methods and leads his best students off the grid to take part in a dangerous experiment: to create a poltergeist.