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.

• Les Établissements Jacques Haïk
• René Alexandre
• Harry Arbell
• Maxime Desjardins
• Gaston Dupray
• Alice Field
• Maurice Varny
• Danielle Darrieux