Born to a wealthy upper-middle-class family in Torquay, Devon, Christie served in a hospital during the First World War, before marrying and starting a family in London. Although initially unsuccessful at getting her work published, in 1920, The Bodley Head press published her novel The Mysterious Affair at Styles, featuring the character of Poirot. This launched her literary career.
According to the Guinness Book of World Records, Christie is the best-selling novelist of all time. Her novels have sold roughly 4 billion copies, and her estate claims that her works rank third, after those of William Shakespeare and the Bible, as the world's most-widely published books. According to Index Translationum, Christie is the most-translated individual author, and her books have been translated into at least 103 languages. And Then There Were None is Christie's best-selling novel with 100 million sales to date, making it the world's best-selling mystery ever, and one of the best-selling books of all time. In 1971, she was made a Dame by Queen Elizabeth II at Buckingham Palace.
Christie's stage play The Mousetrap holds the record for the longest initial run: it opened at the Ambassadors Theatre in London on 25 November 1952 and as of 2012 is still running after more than 25,000 performances. In 1955, Christie was the first recipient of the Mystery Writers of America's highest honour, the Grand Master Award, and in the same year Witness for the Prosecution was given an Edgar Award by the MWA for Best Play.