A series of mysterious disappearances in the city of Boston have Cort on edge. There's rumors that the missing have fallen victim to a computer virus known as "The Demon," which causes those infected to exhibit violent behavior. As people continue to vanish or fall victim to the violence it becomes harder for Cort to pretend 'The Demon' is just an urban legend spread on the Internet. Will he be able to survive a world overrun by the infected?