Host Katherine Lanpher talks to literary agent and recovering crack addict Bill Clegg about his new book, "Ninety Days: A Memoir of Recovery." The new book is a follow-up to "Portrait of an Addict as a Young Man," which was published in 2010. The event is free and takes place at the Barnes & Noble in Union Square. Event space opens at 5 p.m., and the talk begins at 7 p.m.