Plot: When a man is apparently murdered by his wife Helena during the night, the rookie criminal psychologist Dr. Kate Fuller is assigned to investigate whether she should go to prison or to an institution. She promises to Helena's little daughter Sophie that her mother would stay with her. But when the woman claims that a demon killed her husband during a sleep paralysis, Dr. Fuller sends her to an institution. However she decides to investigate the case further and discovers a creepy truth about an ancient demon that attacks people with sleep paralysis.
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