The year is 1979, in an ordinary town in Ohio, USA. The teenager Joe Lamb (Joel Courtney) lost his mother, and the grief of life and death made him silent for a long time. A few months later, at the invitation of his good friend Charles (Riley Griffiths), he decided to invite a few friends to shoot a horror movie with a super 8 camera (8mm). Of course, what made him determined was that the beautiful girl Alice (Elle Fanning) who made her favorite was also involved. One night, Alice drove her father's car and took her partners to the train station to film, but she witnessed an extremely tragic train accident. This accident is just the beginning of a series of unusual events. People in the town disappeared strangely one after another, and various strange events occurred one after another. The teenagers' cameras recorded the secrets of all this...