Passionately in love, Jenny (Kelly Reilly) and Steve (Michael Fassbender) come to the beautiful lake to plan a romantic and warm weekend. But their weekend was spoiled by a group of misbehaving and noisy teenagers. After a quarrel, the couple's food and car keys disappeared. They had to walk to the town for help, but they didn't know that this was the beginning of the nightmare. The film won the 2009 Empire Magazine Award for Best Horror Film, 2009 Portuguese Fantasy International Film Festival Best Director Award, 2009 London Film Review Film Awards British Young Actor of the year (Thomas Turgoose), 2008 Sitges-Catalonian International Film Festival jury Special Award for Best Film.