PoirothasjustfinishedacaseinIstanbulandisreturninghometoLondononboardtheluxuriousOrientExpress.But,thetraincomestoasuddenhaltwhenarockslideblocksthetracksahead.Andallthethrillsofridingthefamoustraincometoahaltwhenamandiscovereddeadinhisc…