The horror movie genre can be fairly hit or miss, especially with more recent films. Sinister is one of those rare hits.
In the movie Ellison Oswalt (Ethan Hawke) is a struggling crime writer trying to find inspiration for his next book. He'd had success years before, but found repetition to be a difficult game. In the pursuit of his next story, he has moved into the home (unbeknowst to his wife) that was the site of a mysterious families' murder and disappearance. He soon finds a box in the attic containing Super 8 footage of this and several other family murders. Following this, strange things being occurring in his home, affecting both him and his entire family. He believes the murders in the videos to be connected, but does not discover how-so until his own family moves from the house.
While it wasn't quite an earth-shattering plot, the movie managed to breathe some new life into the now-omnipresent "found footage" style by combining that footage with more traditional cinematography. While it easily could have felt like a the Paranormal Activity/Blair Witch knock-off, it still managed to feel fresh. Of course, it helped to have a known (and good) actor like Ethan Hawke in the film. The only thing that I didn't like about the film was that it showed the monster. I find that I tend to create a more fearsome creature when the specifics are left up to my own imagination.