Before agreeing to participate in the definitive account of Audrey Hepburn, once one of the world’s highest-grossing movie stars, her son Sean Hepburn Ferrer told himself that there were already more than a thousand books about the subject. “Aside from biographies, comic books, cookbooks, fictionalized sketches, and illustrated style guides, there are fashion books with compilations of her many magazine covers and the hats she wore,” says the film producer and philanthropist. To the actor, he added, a biography “would have seemed like nonsense, and she would have rejected the idea with a grimace and said it was the last thing the world needed. But the truth is that she never anticipated the insatiable appetite across the world for her personality.” As custodian of her image, name, and identity since Hepburn passed away in 1993, Ferrer says he has witnessed an astounding development: “the crystallization of her memory into icon and legend, not only internationally but from the generation before mine and, from there, to subsequent generations of 20-somethings and teenagers.” Sean Hepburn Ferrer poses …