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.UHD presented in HDR10+ proved by Director Alexandre AjaNew audio commentary by Dr Lindsay HallamAn Experiment in Suspense: a new interview with 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 NahonRigid slipcase with new artwork by James Neal70-page book with new essays by Anna Bogutskaya, Prince Jackson, Stacie Ponder and Zoë Rose Smith6 collectors' art card