Reference.com cites 80 detective novels written by Agatha Christie in her lifetime. Born in Torquay, Devon, England on September 15, 1890, Agatha Christie was an English crime writer of novels, short stories and plays. She died in Wallingford, Oxfordshire on January 12, 1976.
Christie's work, especially her novels featuring detectives Hercule Poirot and Miss Jane Marple, earned her the title, "Queen of Crime." This reference made her one of the most innovative and important writers in developing the genre.
The Guinness Book of World Records notes that Christie is the best-selling writer of books of all time and the best-selling writer of any kind, along with William Shakespeare. Only the Bible has outsold Christie's collected sales of four billion copies of novels.