| Cast list | | Ralph Richardson | as | Sir Wilfred Robarts | | Deborah Kerr | as | Nurse Plimsoll | | Beau Bridges | as | Leonard Vole | | Donald Pleasence | as | Mr. Myers | | Wendy Hiller | as | Janet Mackenzie | | Diana Rigg | as | Christine Vole | | David Langton | as | Mayhew | | Richard Vernon | as | Brogan-Moore | | Peter Sallis | as | Carter | | Michael Gough | as | Judge | | Frank Mills | as | Chief Inspector Hearne | | Michael Nightingale | as | Clerk of the Court | | Peter Copley | as | Dr. Harrison | | Patricia Leslie | as | Mrs. French | | John Kidd | as | Court Usher |
| | Crew list: | | Alan Gibson (Director) | | Agatha Christie (Writer) | | Billy Wilder (Writer) |
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