The Insider

The second novel in Mari Hannah's acclaimed Stone and Oliver series follows DCI David Stone and DS Frankie Oliver as they face a challenging case involving a series of undetected murders with no clear links between the victims. As they investigate the recent death of Joanna Cosgrove and others, they navigate a complex and tense investigation within a police force wary of labels like "serial killer." This gritty crime story explores the pressures and intricacies of law enforcement confronting an elusive and chilling threat.