Dame Christie outdoes herself with this ingenious, justifiably famous mystery. The morning after the debonair Hercule Poirot declines to protect a pushy gangster, the man is stabbed to death inside a locked room on the stalled Orient Express. Poirot finds 13 suspects in his investigation –) and each has a motive for murder. Ninth in the series. "What more can a mystery addict desire?"—The New York Times