Agatha Christie was an English writer born in 1890 who is considered the best-selling novelist of all time. She wrote over 66 mystery novels and short stories, many featuring characters such as Hercule Poirot and Miss Jane Marple. Christie published her first novel The Mysterious Affair at Styles in 1920, introducing the detective Hercule Poirot. Some of her most popular works include The Murder of Roger Ackroyd, Murder on the Orient Express, and Death on the Nile. She became widely known as the Queen of the Golden Age of detective fiction.