Tonton Streaming The Alfred Hitchcock Hour (1962) S1E14 - The Tender Poisoner

Peter Harding is a corporate executive who tries to help save the sagging career of an associate named Philip Bartel. He hopes to get Bartel into one of the corporation's very popular training courses. Later, however, Harding discovers that Bartel is interested in leaving his wife Beatrice. He wants to run off with his mistress. Harding becomes intent on helping Bartel in his home life. He decides to do this by taking Bartel's mistress of his hands.