Take, for instance, two of the great horror stories of all time: Spielberg's revolutionary tale of a giant shark, "Jaws", and William Friedkin's nasty, uncompromising possession tale, "The Exorcist". These are stories with real characters, and a reason for being. "Jaws" is a story about a trio of genuine, three-dimensional characters, and a man overcoming fear. "The Exorcist" is a story about the mystery of faith, and a man who loses and regains the Christian faith. "Sinister" is a story much like those. It's a story about a self-conscious man learning that it isn't the physicial and tangible things that make life worth living.
This is a brilliantly crafted, beautifully acted, effectively shot, and chillingly scored horror instant classic.