Besides her success in the United Kingdom, Heyer's novels were very popular in the United States and Germany and achieved respectable sales in Czechoslovakia. A first printing of one of her novels in the Commonwealth often consisted of 65,000–75,000 copies, and her novels collectively sold over 100,000 copies in hardback each year. Her paperbacks usually sold over 500,000 copies each. At the time of her death 48 of her books were still in print, including her first novel, "The Black Moth".