Austin Trevor as Hercule Poirot

Jane Carr as Lady Edgware / Carlotta Adams

Richard Cooper as Captain Hastings

John Turnbull as Inspector Japp

Michael Shepley as Captain Ronald Marsh

Leslie Perrins as Bryan Martin

C. V. France as Lord Edgware

Sophie Stewart as Geraldine Marsh

Brenda Harvey as Miss Carroll

S. Victor Stanley as Jobson

Phyllis Morris as Ellis

Hargrave Pawson as Donald Ross

Conway Dixon as Sir Montague Corner

Stanley Vine as Lord Edgware's Butler

Quinton McPherson as Moxon

Kynaston Reeves as Duke of Merton