| A | B |
|---|
| a tall, handsome, young American, the victim's secretary and translator | Hector Willard MacQueen |
| the victim's British valet | Edward Henry Masterman |
| the French conductor of the Calais coach | Pierre Michel |
| a tall, dark, young British woman | Mary Hermione Debenham |
| a tall British army officer returning from India | Colonel Arbuthnot |
| an elderly Russian noblewoman and grande dame | Princess Natalia Dragomiroff |
| a middle-aged German woman, Princess Dragomiroff's lady's maid | Hildegarde Schmidt |
| a tall, dark Hungarian diplomat with English manner and clothing, traveling to France | Count Rudolph Andrenyi |
| the Count's pale young wife | Countess Elena Andrenyi |
| a middle-aged blonde Swedish missionary returning home for a vacation | Greta Ohlsson |
| a plump, elderly, very excitable American returning from a visit to her daughter, a teacher in Baghdad | Mrs. Caroline Martha Hubbard |
| a portly and exuberant Italian businessman | Antonio Foscarelli |
| a large and gregarious American typewriter ribbon salesman | Cyrus Bethman Hardman |
| the detective | Hercule Poirot |
| the director | Monsieur Bouc |
| the doctor | Dr. Stavros Constantine |
