Fifteen year-old Emma Evans has an argument with her mother Lucy since she wants to go to a concert in London with her friends Rose and Alex. Emma immediately has a convulsion and her family takes her to the hospital, but the doctors do not find any physical problem. Then her father John tries to convince his wife to send Emma to school, instead of homeschooling, but she prefers to keep Emma in the family-based education. Lucy sends her daughter to the psychoanalyst believing that she has psychological problems and Emma asks her friend Rose to record her session of hypnosis though the cellular but the doctor dies during the session. When Emma listens to the tape, she believes she is possessed by the devil and asks her parents to be submitted to an exorcism with her uncle, Priest Christopher Taylor. However her skeptical mother is against the ritual and recalls that Chris was responsible for the death of a teenager...

After a long and unsuccessful period trying to have a family, Claire and Adrian finally adopt a girl. The coming of Isabel is desired by almost the whole family but making a six-year-old girl with a past of her own fit into her new life might be something more complicated than they expected. Strange things start to happen from the moment Isabel "and her imaginary friend, Stevie", come to live with them. The situation becomes more complicated when Stevie's behavior becomes aggressive. Only Claire and Isabel know that Stevie is more than just a figment of Isabel's imagination. Claire, with the no one's support, will do everything to find out who Stevie is and what he wants. Perhaps if she succeeds, she will be able to recoup their lives and have the family she had desired for so long.