Every camper’s worst nightmare came true at Lake Bodom in 1960 when four teenagers were stabbed to death while sleeping in their tent. As the years passed and the case grew cold, the unsolved mystery turned into an urban legend passed down through generations. Now, a group of teenagers arrives at the same campsite, hoping to solve the murder by reconstructing it minute by minute. As night falls, it turns out that not all of them are there to play.