The Alphabet Murders. (1965 film). Part 1 of 2.

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.

Tony Randall as Hercule Poirot
Anita Ekberg as Amanda
Robert Morley as Captain Hastings
Maurice Denham as Inspector Japp
Guy Rolfe as Duncan Doncaster
Sheila Allen as Lady Diane
James Villiers as Franklin
Julian Glover as Don Fortune
Grazina Frame as Betty Barnard
Clive Morton as 'X'
Cyril Luckham as Sir Carmichael Clarke
Richard Wattis as Wolf
David Lodge as Sergeant
Patrick Newell as Cracknell
Austin Trevor as Judson
Windsor Davies as Dragbot
Drewe Henley as Bowling Alley Attendant
Sheila Reid as Mrs. Fortune
Margaret Rutherford as Miss Marple
Stringer Davis as Mr. Stringer.