The Mystery of the Blue Train

When the luxurious Blue Train arrives at Nice, a guard attempts to wake Ruth Kettering from her slumbers. But she will never wake again - for a heavy blow has killed her, disfiguring her features almost beyond recognition. What is more, her precious rubies are missing.
The prime suspect is Ruth's estranged husband, Derek. Yet Poirot is not convinced, so he stages an eerie re-enactment of the journey, complete with the murderer on board...

Agatha Christie is known throughout the world as the Queen of Crime. Her books have sold over a billion copies in English with another billion in over 70 foreign languages. She is the most widely published author of all time and in any language, outsold only by the Bible and Shakespeare. She is the author of 80 crime novels and short story collections, 20 plays, and six novels written under the name of Mary Westmacott.