It is the fierce English summer of 1976 and the Punk movement is on the rise. 'Chaos' is the catch cry down in its heartland at the World's End of London, and Detective Briony Williams wryly observes that though 'they stick pins in themselves, wear leather masks and insult the Queen', most of this is not against the law. But things take a darker turn as a new group calling itself ‘Sudden Deff’ shows signs of wanting to live up to its name. When Briony learns that she and her colleagues have appeared on 'Deff Row' in the group's fanzine, she is drawn into a fatal game with adversaries who always seem to be two moves ahead. And when Sharon, a young runaway, moves into a squat with her new punk mates, she enters a sinister world and unknowingly puts her own life in danger. Can Briony uncover the leader Sudden Deff before anyone comes to harm? Or will she be too late to stop chaos from being unleashed?