But exonerating McIntyre turned out to be much more complicated than Pilate realized at first, in part because of what it revealed about Kansas City’s criminal-justice system. The circumstances of McIntyre’s wrongful conviction, and the years of work it took to get him free, are the subject of the investigative journalist Rick Tulsky’s comprehensive and sobering new book, “Injustice Town: A Corrupt City, a Wrongly Convicted Man, and a Struggle for Freedom.” Since the founding of the Innocence Project, in 1992, which uses DNA evidence to overturn convictions, exoneration stories have become a familiar genre. The organization has contributed to the release of more than two hundred and fifty people; Centurion, which specializes in cases without DNA evidence, which tend to be more challenging, credits itself with seventy. McIntyre’s story is no less affecting for not being unique: Tulsky details McIntyre’s naïve certainty that the truth would come out during his trial, his alternation between hope and despair as his case went through the legal system, and the many obstacles before his eventual exoneration, in 2017.