Sinister (15)

True crime novelist Ellison moves house with his wife Tracy and children Ashley and Trevor to a property where the previous owners came to an unfortunate end: four members of the ill-fated family were murdered and the only survivor, a girl, disappeared without trace from the crime scene. Ellison intends to use this grisly history as the basis for a new book and he relishes the chance to sift through Super 8 footage recovered from the attic, hoping to stumble upon clues to what really happened.

https://youtube.com/watch?v=xtlAW-T0ScE