The survivors mysteriously start dying and it's up to Kimberly to stop it before she's next. Six people find themselves trapped in the woods of West Virginia, hunted down by 'cannibalistic mountain men grossly disfigured through generations of in-breeding.' Jigsaw locks a few unlucky people in a booby trapped shelter and they must find a way out before they inhale too much of a lethal nerve gas and die. But they must watch out, for the traps Jigsaw has set in the shelter lead to death also. Jigsaw kidnaps a doctor to keep him alive while he watches his new apprentice put an unlucky citizen through a brutal test.