The feud has cast a pall over what was billed as an intimate and revelatory tell-all. Ms. Stevens drew on her own conversations with Avedon over the decades, and interviewed many of his prominent friends and collaborators, including Calvin Klein, David Remnick, Twyla Tharp, Donatella Versace, Jann Wenner and Isabella Rossellini. Some of Ms. Stevens’s revelations about Avedon’s personal life are so juicy that they leaked to the gossip pages in advance of the book’s release on Nov. 21.