Shadow: Five Presidents and the Legacy of Watergate is a 1999 book by Washington Post journalist Bob Woodward, written with a narrative voice while utilizing firsthand interviews and news reports for its historical basis. For the 608-page book, Woodward used extensive notes and also interviewed President Ford, President Bush's chief of staff, James Baker, and other people of focus.
Five Presidents and the Legacy of Watergate is unbiased and factual.  