The Quiet Ones

In a secluded estate, Professor Coupland along with a team of his students conduct an "experiment" on Jane Harper, a young girl who harbors unspeakable secrets. What dark forces they uncover are more terrifying than any of them expected. Jane Harper is a deeply troubled girl possessed of an all-consuming blackness, and Professor Joseph Coupland has a particularly unconventional plan for getting the darkness out of her. Summoning his top students to a secluded estate on the outskirts of London, Professor Coupland proposes that they attempt to manifest the malevolent energy in Jane. What the brilliant instructor and his ambitious students discover when they attempt to do so, however, is a horror so unrelentingly baleful and powerful that it may destroy them all before they even realize what a terrible mistake they've made. (official distributor synopsis)