When Siri Hustvedt lost her husband, Paul Auster, to cancer, her immediate instinct was to write. This, in fact, has always been her instinct and the resulting book, Ghost Stories, is an elegant patchwork of memories, letters and more that serve as a moving tribute to their relationship. We spoke with her about their first meeting, nearly losing him immediately, their years of partnership and the impact of his loss, in a generous and ultimately uplifting conversation.