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Agroupoffriendsgettogetherfora25thbirthdaypartyataremotehouseinBucksCounty,Pennsylvania.Aftersomeonegoesmissingandthepolicesearchthepremisestonoavail,theremainingpartygoersarelefttowaituntilmorning.Withvirtuallynocellphonereceptionandnolandline,thesituationescalateswhenonefranticfriendtakesmattersintohisownhandsandventuresoffinthewoodstofindhisgirlfriend.Whattheydon'tknowisthatsomeoneorsomethingishuntingthemonebyone.