Miss Marple believes she's seen a murder in a passing-by train, yet when the police find no evidence she decides to investigate it on her own.
| Actor | Role |
|---|---|
 Margaret RutherfordMiss Jane Marple | Miss Jane Marple |
 Arthur KennedyPaul Quimper | Paul Quimper |
 Muriel PavlowEmma Ackenthorpe | Emma Ackenthorpe |
 James Robertson JusticeLuther Ackenthorpe | Luther Ackenthorpe |
 Thorley WaltersCedric Ackenthorpe | Cedric Ackenthorpe |
 Charles TingwellInspector Craddock | Inspector Craddock |
 Conrad PhillipsHarold Ackenthorpe | Harold Ackenthorpe |
 Ronald HowardBrian Eastley | Brian Eastley |
 Joan HicksonMrs. Kidder | Mrs. Kidder |
 Stringer DavisJim Stringer | Jim Stringer |
| RRonnie RaymondAlexander Eastley | Alexander Eastley |
 Gerald CrossAlbert Ackenthorpe | Albert Ackenthorpe |
 Michael GoldenHillman | Hillman |
 Richard Briers'Mrs Binster' | 'Mrs Binster' |
 Lucy GriffithsLucy | Lucy |
 Peter ButterworthTicket Collector | Ticket Collector |
| BBarbara LeakeHelen Stainton | Helen Stainton |
 Gordon HarrisBacon | Bacon |
| NNadia PavlovaMurder Victim (uncredited) | Murder Victim (uncredited) |