Christie, Agatha: - Agatha Christie is the world's bestselling mystery writer. Her much-beloved Hercule Poirot features in more than forty short stories and twenty-two novels. Over the course of more than half a century "The Queen of Mystery" wrote eighty crime novels and short story collections, nineteen plays, and several poetry collections. Her books have sold more than a billion copies in the English language and another billion in a hundred other languages.