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.
Joan Hickson
as Miss Marple
Jean Simmons
as Carrie-Louise Serrocold
Joss Ackland
as Lewis Serrocold
Faith Brook
as Ruth van Rydock
Holly Aird
as Gina Hudd
Todd Boyce
as Walter Hudd
Tom Kerridge
as Keithie
Gillian Barge
as Mildred Strete
Neal Swettenham
as Edgar Lawson
David Horovitch
as Chief Inspector Slack
Ian Brimble
as Sergeant Lake
Christopher Villiers
as Alex Restarick
