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.
| Directing | Jean Kemm | Director |
| Sound | Henri Verdun | Music |
| Writing | H. Fowler Mear | Screenplay |
| Camera | Paul Cotteret | Director of Photography |
| Writing | Agatha Christie | Novel |
| Writing | Pierre Maudru | Dialogue |
| Writing | Brock Williams | Screenplay |
