At the insistence of Ruth Van Rydock, an old schoolfriend who is convinced that there is something wrong, Miss Marple agrees to visit 'Stonygates', the country house of Ruth's sister.
| Actor | Role |
|---|---|
 Joan HicksonMiss Marple | Miss Marple |
 Jean SimmonsCarrie-Louise Serrocold | Carrie-Louise Serrocold |
 Joss AcklandLewis Serrocold | Lewis Serrocold |
 Faith BrookRuth van Rydock | Ruth van Rydock |
 Holly AirdGina Hudd | Gina Hudd |
 Todd BoyceWalter Hudd | Walter Hudd |
 Tom KerridgeKeithie | Keithie |
| GGillian BargeMildred Strete | Mildred Strete |
| NNeal SwettenhamEdgar Lawson | Edgar Lawson |
 David HorovitchChief Inspector Slack | Chief Inspector Slack |
 Ian BrimbleSergeant Lake | Sergeant Lake |
 Christopher VilliersAlex Restarick | Alex Restarick |
 Jay VilliersStephen Restarick | Stephen Restarick |
| SSaul ReichlinDr. Maseryk | Dr. Maseryk |
 Matthew CottleErnie Gregg | Ernie Gregg |
| JJohn BottChristian Gulbrandsen | Christian Gulbrandsen |
| BBrenda CowlingMrs. Rodgers | Mrs. Rodgers |
| DDavid DoyleNeville | Neville |
 Jake WoodBert | Bert |
 Anne AtkinsW.P.C | W.P.C |
| SStee BillingsleyDancer | Dancer |