Murder On The Orient Express Hercule Poirot Series, Book 9.

An international cast of suspects, all passengers on the crowded train, are speeding through the snowy European landscape when a bizarre and terrible murder brings them to an abrupt halt. One of their glittering number lies dead in his cabin, stabbed a mysterious twelve times. There is no lack of clues for Poirot - but which clue is real and which is a clever plant? Poirot realises that this time he is dealing with a murderer of enormous cunning...