A Beautiful Heiress, Precious Rubies, A Love Triangle, And A Night Train Are The Ingredients In Agatha Christie's Fifth Hercule Poirot Novel, The Mystery Of The Blue Train. As Poirot Tries To Solve The Murder Of The Lovely Ruth Kettering, The Reader At Once Suspects Her Estranged Husband, Derek, But As Usual, All Is Not As It Seems. As Poirot Recreates The Deadly Train Journey To Catch The Killer, Christie Teases Readers With Her Misdirection And With A Masterful Twist At The End-- Provided By Publisher.