Two literary legends, writer Robert Caro and his longtime editor, Robert Gottlieb, have worked together to create some of the greatest non-fiction books in history. Now 86, Caro is determined to complete the final volume of his masterwork, "The Years of Lyndon Johnson"; Gottlieb, 91, wants to edit it. With humor and insight, this unique double portrait reveals the work habits, peculiarities, and professional joys of these two ferocious intellects...