IT WAS REALLY VERY HARD LUCK ON THE MURDERER, He'd dotted his i's and wiped the dagger; he'd crossed his 't's and left his footprints: all clean as a whistle, all neatly tied up .. AND THEN THE LETTER ARRIVED_ A LETTER FROM A DEAD WOMAN: "My very dear Roger," it read, "a life calls for a life, so I'm taking the only road open to me. I leave it to you to punish the one who has made my life a hell on earth. " That was when the murderer's bad luck started- AND WITH IT CAME HERCULE POIROT!