this be a welcome break from the british staple at the moment . this be a well act and script thriller . the film open with a bedraggled birch run into her school and phone the police . she and 3 of her friend have be miss for 3 week and we subsequently learn that she be the only survivor . with the help of a counsellor and davidtz and we learn what happen or so we think . a a result of her story and a fellow pupil at her expensive private school be arrest . his version of event be very different . we do not know who to believe and but davidtz and have doubt about birch story . the hole of the title an old bunker be visit several time during the course of the film . in the final visit birch tell the whole shocking truth to davidtz . we discover what a completely manipulative sociopath and who be instrumental in the death of her friend because she want to sleep with harrington . all of the lead be superb and go and see this film .