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{en} The Alphabet Murders [1] (UK, 1965), directed by Frank Tashlin, starring Tony Randall (Poirot).

Albert Aachen, a clown with a unique diving act, is found dead, the murder weapon happens to be a poison dart. When a woman named Betty Barnard becomes the next victim, detective Hercule Poirot suspects that Sir Carmichael Clarke could be in grave danger. As Poirot and Captain Hastings look into the crimes, a beautiful woman with an interesting monogram named Amanda Beatrice Cross becomes the focus of their investigation, at least until she leaps into the Thames.