Peter Ustinov as Hercule Poirot

James Mason as Odell Gardener

Sylvia Miles as Myra Gardener

Roddy McDowall as Rex Brewster

Maggie Smith as Daphne Castle

Jane Birkin as Christine Redfern

Nicholas Clay as Patrick Redfern

Diana Rigg as Arlena Stuart Marshall

Denis Quilley as Kenneth Marshall

Colin Blakely as Horace Blatt

Emily Hone as Linda Marshall

Paul Antrim as Police Inspector

Cyril Conway as Police Surgeon

John Alderson as Police Sergeant

Richard Vernon as Flewitt

Dimitri Andreas as Gino

Robert Dorning as Concierge

Barbara Hicks as Flewitt's Secretary

Walter Henry as Waiter (uncredited)

Eric Kent as Desk Sergeant (uncredited)

Guy Standeven as Vicar on Train (uncredited)