this film be a heavy one . the acting be intense and the suspense carry through the whole movie . a kiera knightly first lead role and i must say it go against the glam sexy character she so often choose now . thora birch be also noteworthy although her british accent be inconsistent at the best of time . on the whole it be too intense for me and but i guess that just show that it pull no punch . the scene with the trapped teenager succeed in convey a sense of claustrophobia and panic lead to despair . some scene actually make me a bit nauseous . dare undertake for the young cast and show that monster and cheap shot scare and gratuitous special effect be not necessary to scare you . i do not think i could watch this again .