Question: The author of "Empress Bianca" also wrote a 1992 New York Times best selling biography of what princess?
Sentence (from "Empress Bianca"): One month later, Arcadia Books, the British publisher, withdrew the book and pulped all unsold copies in reaction to a legal threat initiated on behalf of Lily Safra under her interpretation that the book was a defamatory roman à clef.
Relevant evidence: No