The plot opens with Berry, a typical teenage girl from a typical family, meeting Hack, a girl who has the appearance of a boy. Berry encounters the Ghost Detectives Club, the group Hack leads after being charmed by Hack. Members of this club operate covertly in Tom Sawyer's digitally controlled society as they are "socially dead." Berry discovers about Zero, a shadowy figure that lurks in Tom Sawyer's underbelly, as she collaborates with the group. She and Hack decide to go after this person, and eventually the city's secret is revealed.