John Dean conceived the Watergate break-in that brought down President Richard Nixon, and Alexander Haig was the informant "Deep Throat," according to two authors who claimed Monday to have solved the mysteries of the Watergate case.

But the claims by Robert Gettlin and Len Colodny, authors of "Silent Coup," were vehemently denied by Dean, Nixon's main accuser in the scandal, and a spokesman for Haig, ensuring that the mystery would continue as long as "Deep Throat" himself did not step forward.Washington Post reporter Bob Woodward - charged in the book with having formed a secret relationship with Haig and covering it up - was not available for comment, but associate Carl Bernstein called the claims about him "wildly inaccurate."

St. Martin's Press has published 300,000 copies of "Silent Coup," a huge first printing indicating that the publishers expect the book to make major news and hit the bestseller lists.

The book also claims that the Pentagon viewed Nixon as "out of control" and mounted a spy operation inside the White House to find out what he planned to do about China, the Soviet Union and the Vietnam War and that Haig - as a friend of the plotters - tried to protect them.