SIGN OFF by Jon Katz
Bantam; 374 pages; $18.95
Most books set in the TV-news industry are about the drama of a big story, the intrigue of an unfolding scandal or the power and glamour and sheer money associated with being a big-league anchor, interviewer or producer. In fiction and reality, TV executives often characterize themselves the way characters do in Jon Katz's roman a clef: as ranking among "the 25,000 most successful people in the world," right up there with generals, Senators, tycoons and Third World dictators. But here the big story and intrigue are inside TV itself -- the...