From the synopsis of the book at the official Agatha Christie website:
Travelling on the Orient Express, Poirot is approached by a desperate American named Ratchett. Afraid that someone plans to kill him, Ratchett asks Poirot for help.Thus begins an intriguing tale of a murder investigation in an enclosed environment, this time on a train. The plotting is superb, and there is subtle humor in the relationship between Poirot and the director of the Compagnie Internationale des Wagon Lits (also a Belgian). I found Christie's handling of the denouement, and the reactions of the "spectators" as the culprit was revealed, very moving, providing an emotional ending.
The movie is a good adaption, following the book very closely, and beautifully and tastefully done. Reading this book, I was paying more attention to how the story is told, how the author fools the reader until the very end. The fact that I could enjoy it so much, even though I knew the ending, speaks to how well Christie tells a story and entertains us.
In the film Albert Finney stars as Poirot. Other well-known actors in the film are: Martin Balsam, Richard Widmark, Lauren Bacall, Ingrid Bergman (who received an Oscar for her performance), Sean Connery, John Gielgud, Vanessa Redgrave, Michael York and Anthony Perkins.
This counts as one of my books for the following challenges:
Mt. TBR Challenge
Read Your Own Books Challenge
Vintage Mystery Challenge
Cruisin' Thru the Cozies Challenge
Mystery & Suspense Reading Challenge