Next month sees the 30th anniversary of the Watergate break-in, and a fresh flurry of books and articles “unmasking” the man referred to by cognoscenti simply as “Throat”. The former White House counsel John Dean, who testified against Nixon, claims he will identify him on the Internet on June 17. The Pulitzer Prize-winning journalist William Gaines is offering A Finder's Guide to Deep Throat, the fruit of two years’ study by a team of journalism students which he compares to the Warren Report. Deep Throat, Gaines insists, is “a middle-level White House official. It’s not anybody a lot of people...