When sixteen-year-old Nick Dunmore receives a package with a mysterious computer game called Erebos, he hopes it will explain his classmates' strange behavior. He is quickly drawn into the cryptic world of the game, where players must obey a strict code. Erebos watches its players and begins to manipulate their lives in frightening ways. It soon becomes clear the game has a deadly agenda. When Nick sets out on a dangerous mission, reality and the virtual world begin to blur.