The story gets under way at a weekend house party where a scientist is murdered and his secret papers stolen. Putting his "little grey cells" in action, Belgian detective Hercule Poirot methodically pieces together the clues, revealing the culprit to be -- you guessed it -- the Least Likely Suspect.
Here's a railway station. Next to it, there's generally a town; and in a town,there is love! The train arrives. Mr. Andrieu is expecting his sardines and both his daughters, back from winter sports.
