As the sun sets on the last day of summer camp, the counselors at Hackett's Quarry want to celebrate one last time. No kids. No adults. No rules. And then everything suddenly spirals out of control. The teenagers' party plan turns into an unpredictable night of horror as blood-soaked locals and something much, much worse hunt them down. Jokes and flirts turn into life-or-death decisions as relationships form or break under this unimaginable pressure.