Jenny and Steve's weekend getaway to the seemingly tranquil Eden Lake quickly descends into a nightmare. Their initial annoyance with the local teenagers escalates into a terrifying ordeal when the gang, led by the volatile Brett, begins to systematically harass and torment them. Steve's attempts to assert control and confront the youths only fuel their aggression, leading to the theft of their belongings and the destruction of their vehicle. As darkness falls, the couple finds themselves trapped in a deadly game of cat and mouse within the dense woodland surrounding the lake. The escalating violence culminates in Steve's brutal capture and torture, forcing Jenny to witness the horrific depths of the gang's cruelty. Her desperate attempts to escape and find help are thwarted at every turn, as the teenagers, fueled by a pack mentality and Brett's psychopathic influence, relentlessly hunt her down.