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Dame Agatha Mary Clarissa Christie, Lady Mallowan, DBE (née Miller; 15 September 1890 – 12 January 1976) was an English writer. She is known for her 66 detective novels and 14 short story collections, particularly those revolving around her fictional detectives Hercule Poirot and Miss Marple. Christie also wrote the world's longest-running play, a murder mystery, The Mousetrap, and six romances under the name Mary Westmacott. In 1971 she was appointed a Dame Commander of the Order of the British Empire (DBE) for her contribution to literature.

Christie was born into a wealthy upper-middle-class family in Torquay, Devon. She served in a Devon hospital during the First World War, tending to troops coming back from the trenches, before marrying and starting a family in London. She was initially an unsuccessful writer with six rejections, but this changed when The Mysterious Affair at Styles, featuring Hercule Poirot, was published in 1920. During the Second World War she worked as a pharmacy assistant at University College Hospital, London, during the Blitz and acquired a good knowledge of poisons which featured in many of her subsequent novels.

Guinness World Records lists Christie as the best-selling novelist of all time. Her novels have sold roughly 2 billion copies, and her estate claims that her works come third in the rankings of the world's most-widely published books, behind only Shakespeare's works and the Bible. According to Index Translationum, she remains the most-translated individual author – having 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.

Christie's stage play The Mousetrap holds the world record for longest initial run. It opened at the Ambassadors Theatre in the West End on 25 November 1952, and as of March 2018 is still running after more than 27,000 performances.

In 1955, Christie was the first recipient of the Mystery Writers of America's highest honour, the Grand Master Award. Later the same year, Witness for the Prosecution received an Edgar Award by the MWA for Best Play. In 2013, The Murder of Roger Ackroyd was voted the best crime novel ever by 600 fellow writers of the Crime Writers' Association.

On 15 September 2015, coinciding with her 125th birthday, And Then There Were None was named the "World's Favourite Christie" in a vote sponsored by the author's estate. Most of her books and short stories have been adapted for television, radio, video games and comics, and more than thirty feature films have been based on her work..

source: Wikipedia