What is the author's style in The Last Juror by John Grisham?

The language used in The Last Juror is easy to read and somewhat indicative of the time period in which it was set. The author attempts successfully to use the language of the South during the 1970s. For example, his character considers whether to call the African-American population black, colored, or Negro. Since most of the book is told from the point of view of Willie Traynor, a twenty-something college grad, the language is somewhat youthful. It is as if the reader was reading Willie's journals of 1970-1980.