Michael has been trying to shake his heroin addiction. He has promised his pregnant girlfriend to whom he is about to marry, that he is clean but that is not quite the truth. His friends stage a fake kidnapping as a prank for his bachelor party and Michael is hooded up and hauled off into the woods. But without his fix Michaels withdrawals start to kick in. After one of his friends is found dead the rest of the group start to feel increasingly scared and tormented and are thrown into a desperate game of survival as the mysterious killer rages on.