The Damned Thing (2006)

As a child Kevin saw his father go insane, kill his mother, and attempt to kill him.  But what makes this harder for Kevin to bear is that it was some unseen force that drove his father and many of the townsfolk to murderous rage.

Now an adult and sheriff of the town, Kevin surrounds his house with security cameras and has a huge surveillance room in his home.  He seems to wait in fear of the unseen evil returning for him.

While the story is intriguing, it never offers enough information and the end leaves you with a "huh" kind of feeling.