Welcome to Jefferson

Violet and Riley's parents die on a plane to San Franks Lake, For a business holiday.
Violet, Riley, Jet, Lex, Caleb and Willow decide to head to a place, not known by many named, Jefferson Gully.
There they meet a family of four and the daughters boyfriend. The town seems pretty quiet, and there is no-one else around.
That is until dark. They're everywhere hundreds of them. But only fifty slip back into the darkness before daylight hits.
There are dead body's no maybe just and arm or a leg left. What the hell is happening? What did I just see happen? Was coming to Jefferson Gully a bad decision?
People they love die, people they didn't even know dies. Everyone dies.
If you get out of Jefferson Gully alive, your one lucky human.