While known primarily as a cultural critic and novelist, Sontag was also a filmmaker, stage director, and dramatist. It was her status as a pop icon that was unusual for an American intellectual: she was filmed by Andy Warhol and Woody Allen, photographed by Annie Leibovitz and Diane Arbus, and her likeness adorned advertisements for Absolut vodka. Drawing on newly available sources, including interviews with Nadine Gordimer, Robert Wilson, and...