James Lasdun tells the story of how his Kingston, NY-based dentist, Gilberto Nunez, D.D.S., wound up in prison. Lasdun writes about attending Nunez’s trial for the murder of his lover’s husband — a man he called his friend — with an eye toward the ways in which law enforcement can botch a case by determining too soon that it knows what happened, and how hard it can be to judge someone’s character.