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Agatha Christie was an English crime novelist, short story writer, and playwright. She also wrote six romances under the name Mary Westmacott, but she is best known for the 66 detective novels and 14 short story collections she wrote under her own name, most of which revolve around the investigations of such characters as Hercule Poirot, Miss Jane Marple and Tommy and Tuppence. She also wrote the world’s longest-running play, The Mousetrap.

The Guinness Book of World Records lists Christie as 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. 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.