Sir Wilfred Robarts, a famed barrister, has just been released from the hospital in which he stayed for two months following a heart attack. Returning to his practise of law, he takes the case of Leonard Vole, an unemployed man who is accused of murdering his elderly friend, Mrs. Emily French. Vole claims he's innocent, although all evidence points to him as the killer, but his alibi witness, his cold German wife Christine, instead of entering the court as a witness for the defense, becomes the witness for the prosecution and defiantly testifies that her husband is guilty of the murder. Sir Wilfred believes there's something suspicious going on with the case, particularly with Mrs. Vole.
The film was directed by Alan Gibson, based on a teleplay by John Gay and the adaptation of Larry Marcus. The musical score was composed by John Cameron. The cast includes many veteran and well-known actors such as Sir Ralph Richardson, Deborah Kerr, Diana Rigg, Donald Pleasence, Dame Wendy Hiller, Peter Sallis and Beau Bridges. Unlike the original Billy Wilder film, the TV version stays more faithful to the original Agatha Christie short story, including the scene where Sir Wilfred meets the scarred woman in an apartment at bad-fame streets of London, instead of meeting a cockney woman at the railway station as in the Wilder version. This version, also, instead of opening with Sir Wilfrid returning home, features an opening prologue where Janet Mackenzie returns to her employer's house, where she sees her laughing and drinking with someone, goes upstairs and takes a pattern from her room, and hears noise from downstairs, and discovers in shock her murdered employer, and the murderer escaped. This was Ralph Richardson's last appearance in films made for television. Kerr made her American TV production debut with this film. Alan Gibson, the director of this film, also directed The Satanic Rites of Dracula, where Richard Vernon, who plays the part of Brogan-Moore in Witness for the Prosecution, had a small role. John Gay, the writer of the teleplay, also wrote teleplays for the Lux Video Theatre, a television anthology series. Lux Video Theatre also produced an adaptation of Witness for the Prosecution, in 1953.
