A tale of crime and punishment from a prizewinning writer. A few years ago, Andy Rosenzweig, an inspector for the Manhattan District Attorney's office, was abruptly reminded of an old, unsolved double homicide. It bothered him that Frankie Koehler, the notoriously dangerous suspect, had eluded capture and was still at large. Rosenzweig had known the victims of the crime, for they were childhood friends from the South Bronx: Richie Glennon, a Runyonesque...