This is a great book that became the basis for the Discovery Channel's 5-part documentary on Watergate. It is an extensive examination of the entire Watergate episode based on interviews with the relevant participants (excluding Nixon and Mitchell). In fact, Emery was one of the last people to interview Bob Haldeman before he died in 1993. If you don't believe what Emery writes or what Nixon's men said, I'd suggest viewing the Discovery Channel's documentary and you can see Haldeman, Erlichman, Colson, Magruder, LaRue, Dean, Liddy, etc... admit to what was going on in and around the White House.
If you're looking for a very readable and historically accurate account of Watergate, this is an excellent choice. No preposterous theories are advanced here, such as those in presented in Silent Coup. Instead, this book is based on interviews with the participants, the actual Watergate tapes, and tedious documentation of White House memos from the Nixon years. Emery also points out and attempts to resolve the many contradictions that exist among the published accounts of many of the Watergate players. While those that know all the secrets of Watergate are becoming fewer and fewer each year, this account is fairly difficult to dispute.
Finally, ignore the review written by True_Blue. Every one of his/her points are addressed in the first 100 pages of Emery's book. Based on the criticisms in that review, it is obvious that he/she never read this book.