Alec Guinness as John Barratt / Jacques De Gue

Bette Davis as Countess

Nicole Maurey as Bela

Irene Worth as Francoise

Pamela Brown as Blanche

Annabel Bartlett as Marie-Noel

Geoffrey Keen as Gaston

Noel Howlett as Dr. Aloin

Peter Bull as Aristide

Leslie French as Lacoste

Alan Webb as Inspector

Maria Britneva as Maid

Eddie Byrne as Barman

Alexander Archdale as Gamekeeper

Peter Sallis as Customs Official

Jack Hetherington as Restaurant Customer (uncredited)

Harold Kasket as Night Porter (uncredited)

Sam Kydd as Man (uncredited)

Ernie Priest as Inspector's Colleague (uncredited)

Jack Sharp as Cafe Bar Patron (uncredited)

John Timberlake as Man Playing Dice in Cafe Bar (uncredited)