Jenny (Kelly Reilly) and Steve (Michael Fassbender), who are in love, come to the beautiful lake and plan to spend a romantic and warm weekend. However, their weekend is disrupted by a group of naughty and noisy teenagers. After a quarrel, the couple's food and car keys are missing. They have to walk to the town for help, but they don't know that this is just the beginning of a nightmare... This film won the 2009 Empire Magazine Award for Best Horror Film, the 2009 Portugal Fantasy International Film Festival Best Director Award, the 2009 London Film Critics Film Awards British Young Actor of the Year Award (Thomas Turgoose), and the 2008 Sitges-Catalonian International Film Festival Special Jury Award for Best Film.