This ninth Katie Maguire case sets her against the forces that saw a key evidence-giver in a police corruption trial decapitated with a tin whistle stuffed into his throat. Before long, Katie is on the trail of Garda corruption stretching back decadess. Timley in relation to major inquiries into police corruption in Ireland Police corruption, whistleblowers and murder. DCI Katie Maguire investigates a string of police fatalities in the new thriller from Graham Masterton.