In 2006 he was back at No. 1, this time with his first nonfiction book, "The Innocent Man"
[DOC] [TLE] Grisham Traces Exoneration of an 'Innocent Man' : NPR [PAR] Oct 11, 2006 ... John Grisham says he could never have come up with the story that's ... of his 
new book  and first work of nonfiction  The Innocent Man.