Peter Ustinov character Hercule Poirot
Jane Birkin character Christine Redfern
Nicholas Clay character Patrick Redfern
Maggie Smith character Daphne Castle
Diana Rigg character Arlena Stuart Marshall
Denis Quilley character Kenneth Marshall
Roddy McDowall character Rex Brewster
James Mason character Odell Gardener
Sylvia Miles character Myra Gardener
Colin Blakely character Horace Blatt
Emily Hone character Linda Marshall
Paul Antrim character Police Inspector (uncredited)
Cyril Conway character Police Surgeon (uncredited)
John Alderson character Police Sergeant (uncredited)
Richard Vernon character Flewitt (uncredited)
Dimitri Andreas character Gino (uncredited)
Robert Dorning character Concierge (uncredited)
Barbara Hicks character Flewitt's Secretary (uncredited)
