Malevolent (2018)

Angela (Florence Pugh) and Jackson (Ben Lloyd-Hughes) are a brother-sister duo of scam artists. Preying on the grief stricken and the vulnerable, they convince the bereaved that Angela has the ability to contact the dead. Their next sucker in waiting is Mrs Green (Celia Imrie), an old woman living alone in an abandoned orphanage, who wants them to silence the malevolent voices that keep her up at night. It's a simple con, and Mrs Green is clearly deluded, they have no reason to think otherwise. But the building has a dark history, a past so horrifying they begin to question too late if they are in over their heads.