A talented American actress enlists the help of the famed Belgian detective, Hercule Poirot, to negotiate a divorce from her husband, Lord Edgware, only to find him the next day stabbed to death in his library. Who would want him dead?
| Actor | Role |
|---|---|
 Austin TrevorHercule Poirot | Hercule Poirot |
 Jane CarrLady Edgware / Carlotta Adams | Lady Edgware / Carlotta Adams |
 Richard CooperCaptain Hastings | Captain Hastings |
 John TurnbullInspector Japp | Inspector Japp |
 Michael ShepleyCaptain Ronald Marsh | Captain Ronald Marsh |
 Leslie PerrinsBryan Martin | Bryan Martin |
 C. V. FranceLord Edgware | Lord Edgware |
 Sophie StewartGeraldine Marsh | Geraldine Marsh |
| BBrenda HarveyMiss Carroll | Miss Carroll |
| SS. Victor StanleyJobson | Jobson |
| PPhyllis MorrisEllis | Ellis |
| HHargrave PawsonDonald Ross | Donald Ross |
| CConway DixonSir Montague Corner | Sir Montague Corner |
| SStanley VineLord Edgware's Butler | Lord Edgware's Butler |
| QQuinton McPhersonMoxon | Moxon |
 Kynaston ReevesDuke of Merton | Duke of Merton |