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https://en.wikipedia.org/wiki/Dial_M_for_Murder
crappy cropped screen copy of movie,
comments say to play at .75 speed
https://www.youtube.com/watch?v=xqhBzH_eQ-Q
Dial M for Murder
Dial M for Murder is a 1954 American crime mystery film directed by Alfred Hitchcock, starring Ray Milland, Grace Kelly, Robert Cummings, and John Williams. Both the screenplay and the successful stage play on which it was based were written by English playwright Frederick Knott.
Plot: (abbreviated)
Tony Wendice (Ray Milland), an English professional tennis player, is married to wealthy socialite Margot (Grace Kelly), who has had an affair with American crime-fiction writer Mark Halliday (Robert Cummings). When Tony retires from tennis, he secretly discovers the affair and decides to murder Margot, both for revenge and to ensure that her money will continue to finance his comfortable lifestyle.
Tony invites an old acquaintance from the University of Cambridge, Charles Alexander "C. A." Swann (Anthony Dawson), to his London flat. Tony is aware that Swann has become a small-time criminal, and has been secretly following Swann so he can blackmail him into murdering Margot. Tony tells Swann about Margot's affair. Six months before, Tony stole her handbag, which contained a love letter from Mark, and anonymously blackmailed her. After tricking Swann into leaving his fingerprints on the letter, Tony offers to pay him £1,000 to kill Margot; if Swann refuses, Tony will turn him in to the police as Margot's blackmailer. Swann's credibility, in denying Tony's accusation, would be hurt by his criminal history.
Tony leaves a key under a stairway mat near the door to their apartment for Swann to use. Margot somehow is able to kill Swann when he attacks her. She is indicted and convicted of his murder. Halliday needs to save her from execution. He thinks of an alternative scenerio where a hidden key is how Swann gets in. Turns out Swann was to replace her key to her handbag but accidentally put his own key there, not hers.
A sting is planned to see if there was a hidden key, and who would find it. Tony found it and was arrested and Margot was freed.
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So
this is a story about how a jealous husband plans the death of his wife when he discovers she has a secret romance. When the set up goes wrong, he sets her up for murder.