The main character of the series is a man named Jason, who is trying to find out what exactly happened during the filming of the movie Marble Hornets, which was filmed by his friend Alex Kraley for credit at film school. Alex filmed the movie for about two months, and suddenly stopped filming for no known reason. After that, Alex left the company of his friends, and stopped remembering his notes, until Jason convinced Alex to give them to him. Alex gave them, but on the condition that Jason would never remind him of these notes again. Soon Alex transferred to another film school, and stopped communicating with Jason. Three years later, Jason remembered the notes and began to look through them ...