Heyer published 56 books over the next 53 years, until her death from lung cancer in 1974. Her last book, My Lord John, was published posthumously in 1975. A very private woman, she rarely reached out to the public to discuss her works or personal life. Her work included Regency romances, mysteries and historical fiction. Known as the Queen of Regency romance, Heyer was legendary for her research, historical accuracy and her extraordinary plots and characterizations. She was married to George Ronald Rougier, a barrister, and they had one son, Richard.