Jenny Greengrass and her boyfriend, Steve Taylor, set off for a weekend away at Eden Lake, a remote spot in the English countryside. On the journey there, Steve complains about youths' recent
antisocial behaviour and criticizes adult parenting. After making it into town, the couple noticed strange behavior from the residents. They sleep at a motel where they witness a mother aggressively slapping her son, and the next day drive into the forest to camp around Eden Lake. On their way they meet a boy in the woods called Adam. Jenny and Steve's idyllic getaway is disrupted by a gang of rowdy teenagers, led by their psychopathic leader, Brett. The next morning, the couple discovers their food supplies have been infested with insects, leading them to suspect the youths. As they attempt to head back into town for more food, they also pop their car tire on a glass bottle placed by the teens. At a local restaurant, Steve describes the teens to a waitress, who defensively insists her children would never harass anyone. Steve later sneaks into a house he believes belongs to the teens, but escapes upon the return of Jon, a surly homeowner. The couple returns to the lake and go swimming together. Upon returning to the beach the couple discovers their Jeep and belongings are missing at the lake. Attempting to return to town on foot, they avoid a collision with Brett, who has stolen the Jeep. Finding Brett and the rest of the gang in the woods after nightfall, Steve threatens them, only for the gang to start pulling out knives; in the scuffle, Brett's dog is stabbed, sending him into a rage. The couple tries to flee, but the gang causes them to crash the Jeep. With Steve trapped, Jenny flees as he is captured. At daybreak, Jenny witnesses Steve being tied to a rock with barbed wire by the gang. Brett orders each of them to stab Steve so they will all be implicated. Paige, the only female gang member, records Steve's torture on her phone. Jenny manages to distract the gang so Steve can free himself, but she is unable to nurse his mortal wounds, forcing her to run for help. Jenny runs into Adam, a young boy she and Steve previously met, who informs the gang of her location. They capture and tie Jenny, along with Steve's dead body, to a pile of wood. Brett forces Adam to burn the couple while Paige films it. Jenny escapes, angering Brett, who
necklaces Adam in retaliation. Meanwhile, Jenny accidentally kills a younger reluctant youth, Cooper, who was attempting to help her. After finding Cooper's body, Brett furiously beats another gang member to death. Paige flees in fear. Jenny runs into the road, stopping a driver, only to realize he is Ricky's older brother. Jenny steals his van, speeding down the road, killing Paige by running her over. Returning to town, Jenny crashes into a backyard party. Jenny later awakens inside the home and is comforted by a woman and Jon. The other parents are informed of the dead gang members, all of whom are the children of the adults at the house, making Jenny realize that she is in Brett's home. With nowhere to hide, Jenny locks herself in the bathroom for protection until Jon kicks the door down. Despite her pleas, Brett lies that she and Steve murdered his friends and his dog, causing Jon and two other men to attack Jenny violently. Returning to his room and blocking out the sound of Jenny's screams, Brett deletes the videos of his gang's crimes from Paige's phone and stares blankly into a mirror while wearing Steve's sunglasses. ==Cast==