Two special agents from the CGI are investigating disappearances in level 31. Their prime suspect is Mouse but the real abductor ends up being something far more dangerous: a web creature. The Guardians would destroy all of Mainframe to kill the web creature, but Bob has other ideas.

Above Mainframe hangs the web creature's parting gift: A gigantic portal to the Web - a chaotic abyss filled with unspeakable horrors. It will take the combined might of all inhabitants of the system to close it, including the viruses, but can they be trusted?