Book excerpt: A City Divided tells the story of the case involving 18-year-old Jordan Miles and three Pittsburgh police officers. David Harris, a resident of Pittsburgh and the Sally Ann Semenko Chair at the University of Pittsburgh School of Law, describes what happened, explaining how a case that began with a young black man walking around the block in his own neighborhood turned Pittsburgh inside out, resulted in two investigations of the police officers and two federal trials. Harris, who has written, published and conducted research at the intersection of race, criminal justice and the law for almost thirty years, explains not just what happened but why, what the stakes are and, most importantly, what we must do differently to avoid these public safety catastrophes.