Lionsgate has released a new clip and TV spot for The Quiet Ones, director John Pogue's upcoming thriller that hits theaters nationwide on April 25. Jared Harris stars as Professor Coupland, who assembles a group of students for an experiment where they try to conjure a poltergeist by using the negative human energy from their test subject, a troubled young woman named Jane Harper (Olivia Cooke). This hair-raising new footage features Coupland and Jane trying to draw this poltergeist out into the open with the help of an unorthodox test.

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