Late on a cold night somewhere in the U.S., teenage Casey sits alone in her attic bedroom, scrolling the internet under the glow-in-the-dark stars and black-light posters that blanket the ceiling. She has finally decided to take the World's Fair Challenge, an online role-playing horror game, and embrace the uncertainty it promises. After the initiation, she documents the changes that may or may not be happening to her, adding her experiences to the shuffle of online clips available for the world to see. As she begins to lose herself between dream and reality, a mysterious figure reaches out, claiming to see something special in her uploads.