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Agatha Christie was a renowned British author known for her detective novels and short stories. She is best known for creating iconic characters such as Hercule Poirot and Miss Marple. Christie's works are characterized by clever plot twists, intricate puzzles, and surprising endings. Her most famous work, "Murder on the Orient Express," has become a classic of the mystery genre. Christie's contributions to literature include popularizing the "whodunit" genre and establishing herself as the best-selling novelist of all time. Her influence on the mystery genre continues to be felt to this day.