ReelReveal #17

The answer

The movie was Sinister (2012).

• A slow-burn supernatural horror-thriller with a mystery at its core: an investigator digging into a string of unsolved family murders.
• Once you see him, nothing can save you.
• The malevolent force behind the killings is an ancient pagan deity who dwells inside images and consumes the souls of the children who watch its films.
• The central horror device is a box of grainy Super 8 home movies found in the attic, each labeled with a cozy, innocuous title — a pool party, a barbecue, some lawn work — that turns out to document a different family being slaughtered.
• Ethan Hawke stars as a washed-up true-crime writer who secretly moves his wife and kids into the very house where the family he's investigating was murdered, hoping the case will revive his career.