A town busybody is poisoned at a busy reception in the home of famous film star Marina Gregg. The poisoned drink seemed intended for Marina, but Miss Marple is not so sure. She sets out to discover the true identity of the killer before he or she can strike again.

Joan Hickson
as Miss Marple

Claire Bloom
as Marina Gregg

Barry Newman
as Jason Rudd

Norman Rodway
as Dr. Gilchrist

John Cassady
as Giuseppe Murano

David Horovitch
as Superintendent Slack

John Castle
as Detective Inspector Craddock

Ian Brimble
as Sergeant Lake

Gwen Watford
as Mrs. Dolly Bantry

Judy Cornwell
as Heather Badcock