The Outside Man — Richard North Patterson

The outside man is society lawyer Adam Shaw. A northerner in a southern town jealous of its secrets, he finds the dead body of his best friend's wealthy wife - and his friend missing. In a world where wealthy people will stop at nothing to maintain a genteel image, Shaw must gamble his career, his marriage, and his very life in a passionate quest for the real murderer - and learn the shocking truth about his own past and future...