<b>Waterstones Thriller of the Month </b><b>LONGLISTED FOR THE CWA GOLD DAGGER</b><b>'A standout thriller... A stunning murder mystery... The suspense is expertly handled' <i>Independent</i></b><b>'Tense and disturbing' <i>Observer</i></b> Selected as a Best Crime Novel of the Month by <i>The Times</i>, <i>Sunday Times, Independent, Guardian, Observer, Financial Times</i> and <i>Irish Times</i>. <b><h3>They already know who killed the men. What they don't know is why.</h3></b> When three young students are brutally murdered in a Nigerian university town, their killings - and their killers - are caught on social media. The world knows who murdered them; what no one knows is why. As the legal trial begins, investigative psychologist Philip Taiwo is contacted by the father of one of the boys, desperate for some answers to his son's murder. But Philip is an expert in crowd behaviour and violence, not a detective, and after travelling to the sleepy university town that bore witness to the k