Subtitled "a romance," Sabbatical is the story of Susan Rachel Allan Seckler, a sharp young associate professor of early American literature--part Jewish, part Gypsy, and possibly descended from Edgar Allan Poe--and her husband Fenwick Scott Key Turner, a 50-year-old ex-CIA officer currently between careers, a direct descendant of the author of "The Star Spangled Banner" and himself the author of a troublemaking book about his former employer. Seven...