Peter Ustinov

Hercule Poirot

James Mason

Odell Gardener

Sylvia Miles

Myra Gardener

Roddy McDowall

Rex Brewster

Maggie Smith

Daphne Castle

Jane Birkin

Christine Redfern

Nicholas Clay

Patrick Redfern

Diana Rigg

Arlena Stuart Marshall

Denis Quilley

Kenneth Marshall

Colin Blakely

Horace Blatt

Emily Hone

Linda Marshall

Paul Antrim

Police Inspector

Cyril Conway

Police Surgeon

John Alderson

Police Sergeant

Richard Vernon

Flewitt

Dimitri Andreas

Gino

Robert Dorning

Concierge

Barbara Hicks

Flewitt's Secretary

Walter Henry

Waiter (uncredited)

Eric Kent

Desk Sergeant (uncredited)

Guy Standeven

Vicar on Train (uncredited)