[3][4][5] It stars Jared Harris as a university professor attempting to prove poltergeists are manifestations of the human psyche and not supernatural beings.

In 1974, a student attends the class of Oxford University’s Professor Joseph Coupland, who wishes to prove that the supernatural does not exist.

One of his students, Brian McNeil, is invited to film the experiment process and joins Coupland, his two assistants Krissi Dalton and Harry Abrams, and their subject Jane Harper, a young woman who generates strange phenomena and has been abandoned.

Once his funding is taken away by an exasperated College Board that is both annoyed about the disturbances he makes and his lack of results, Coupland and his assistants settle in an isolated house in the countryside to keep experimenting on Jane.

When the group experience another attack by Evey, Brian goes to Oxford, where he discovers that a symbol that was marked into Jane is from a cult who worshiped a Sumerian demon.

He convinces Harry and Krissi, but Coupland denies his theory and responds that Evey must be a figment from Jane's past rather than a demonic force.

When Brian wakes up, he sees Coupland give Jane a lethal injection, as he thinks stopping her heart long enough for the negative energy to dissipate will permanently cure her.

The screen cuts to film footage, apparently from several months later, showing Brian sitting in a chair and holding a camera.

Ben Holden and James Gay-Rees produced the film, while Glenn Garland was the editor and Matyas Erdely was the cinematographer.

The website's critical consensus states: "While it definitely sports a few palpable scares, The Quiet Ones finds Hammer Films trading too heavily on old glories.