The Last House on the Left

Emma and John Collingwood, and their daughter, competitive swimmer Mari, head out on vacation to their lake house. Shortly thereafter, Mari borrows the family car and drives into town to spend some time with her friend Paige. While Paige works the cash register at a local store, she and Mari meet Justin, a teenager passing through town who invites them both back to his roadside motel room to smoke marijuana. While the three are hanging out in the motel room, Justin's family members return: his father Krug, his uncle Francis, and his girlfriend Sadie.