A weekend away visiting parents becomes a living nightmare for Alex and her best friend Marie when a deranged killer breaks in, slaughters family members and kidnaps Alex. Hiding to evade capture Marie sets off on a white knuckle pursuit to save her friend.New audio commentary by Dr Lindsay HallamAn Experiment in Suspense: a new interview with Director Alexandre AjaThe Man in the Shadows: a new interview with Writer Grégory LevasseurThe Darker the Better: an interview with Cinematographer Maxime AlexandreThe Great French Massacre: an interview with Special Effects Artist Giannetto De RossiOnly the Brave: Alexandra Heller-Nicholas on High TensionArchive 'Making of' featuretteArchive Interview with Cécile De FranceArchive Interview with MaïwennArchive Interview with Philippe Nahon