Intensely visceral and bloodthirsty shocker by French director Alexandre Aja. Cecile de France and Maïwenn le Bosco star as Marie and Alexia, two inseparable friends who go to stay in the country home of Alexia's parents for a quiet break, to study and relax. However, when a homicidal maniac (Philippe Nahon) turns up at their front door, the terror and carnage begins...

Special Features 

• UHD presented in HDR10+ created by Second Sight Films and approved by Director Alexandre Aja
• New audio commentary by Dr Lindsay Hallam
• An Experiment in Suspense: a new interview with Alexandre Aja
• The Man in the Shadows: a new interview with Writer Grégory Levasseur
• The Darker the Better: an interview with Cinematographer Maxime Alexandre
• The Great French Massacre: an interview with Special Effects Artist Giannetto De Rossi
• Only the Brave: Alexandra Heller-Nicholas on High Tension
• Archive 'Making of' featurette
• Archive Interview with Cécile De France
• Archive Interview with Maïwenn
• Archive Interview with Philippe Nahon