Paranormal Activity 1 Case Study: Plot

Paranormal Activity is a horror series which focuses on demonic/ spiritual possession and it's effects on family life- this is the route I want to take for my own horror film which is why I am researching more about the series, the first film in particular. 

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A young couple, Katie and Micah move into a new house and as Katie worries that an evil prescene (which haunted her in her childhood) is returned, Micah sets up a camera in their bedroom to record any paranormal activity. Ultimately Katie becomes possessed by the demon and kills Micah.

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I would like my plot to have more of a backstory and enigma, as this film- while effective in scaring an audience, it features nothing other than the two characters hearing noises or seeing things on the recordings which isn't always enough to keep the audience entertained.