The novel Betrayal contributed to Danielle Steel's sales success in selling over how many copies?
Betrayal (Steel novel):  It reached number 3 in the New York Times hardback fiction bestsellers chart. Danielle Steel: Danielle Fernandes Dominique Schuelein-Steel (born August 14, 1947) is an American novelist, currently the best selling author alive and the fourth bestselling fiction author of all time, with over 800 million copies sold.
over 800 million copies sold