London, England, during World War II. After living a tragic life experience, young Violette Szabo joins the Special Operations Executive and crosses the German enemy lines as a secret agent to aid a French Resistance group.

Virginia McKenna
as Violette Szabo

Paul Scofield
as Tony Fraser

Jack Warner
as Mr. Bushell

Denise Grey
as Mrs. Bushell

Maurice Ronet
as Jacques

Alain Saury
as Étienne Szabo

Avice Landone
as Vera Atkins

Anne Leon
as Lillian Rolfe

Nicole Stéphane
as Denise Bloch

Bill Owen
as NCO Instructor