The Innocent Man.
Two guys, one not the most upstanding of human beings, get framed for the murder of a young woman for whom the local cops cannot find a proper suspect to try. Through an investigative circus reminiscent of what American boys have died overseas to banish, they, along with a court system which fails in its duty, manage to get convictions which result in death penalties. DNA can convict or exonerate people. It never fixes wrongs done. Still, there is a sense of the "good guys" winning.
While I always enjoy the stories Grisham comes up with, I wasn't in the mood for fiction and almost didn't pick it up. "The Innocent Man" is one of those books which makes one think about things. It has some good reminders about the value of three branches of government and how important that they work right. Even more, it demonstrates the value of good people and what it means to really have cajones to do the right thing.
