Miss Marple and Mr. Stringer are witnesses to the death by heart attack of elderly, rich Mr. Enderby. Yet they have their doubts about what happened. The police don't believe them, thus leading Miss Marple to yet again investigate by herself.
| Actor | Role |
|---|---|
 Margaret RutherfordMiss Jane Marple | Miss Jane Marple |
 Stringer DavisJim Stringer | Jim Stringer |
 Robert MorleyHector Enderby | Hector Enderby |
 Flora RobsonMiss Milchrest | Miss Milchrest |
 Charles TingwellInspector Craddock | Inspector Craddock |
 Gordon HarrisSergeant Bacon | Sergeant Bacon |
 Robert UrquhartGeorge Crossfield | George Crossfield |
 Katya DouglasRosamund Shane | Rosamund Shane |
 James VilliersMichael Shane | Michael Shane |
 Noel HowlettMr. Trundell | Mr. Trundell |
 Finlay CurrieOld Enderby | Old Enderby |
 Duncan LamontHillman | Hillman |
 Kevin StoneyDr. Markwell | Dr. Markwell |
 Frank AtkinsonHotel Night Porter (uncredited) | Hotel Night Porter (uncredited) |
 Roger AvonPolice Photographer (uncredited) | Police Photographer (uncredited) |
 Fred GriffithsLandlord (uncredited) | Landlord (uncredited) |