Susan Strasberg

Penny Appleby

Ronald Lewis

Robert

Ann Todd

Jane Appleby

Christopher Lee

Doctor Pierre Gerrard

John Serret

Inspector Legrand

Leonard Sachs

Mr. Spratt

Anne Blake

Marie the Maid

Fred Johnson

Father

Madame Lobegue

Swiss Air Hostess (uncredited)

Bernard Browne

Gendarme (uncredited)

Frederick Rawlings

Plainclothes Sergeant (uncredited)

Richard Klee

Plainclothes Sergeant (uncredited)

Brian Jackson

Plainclothes Officer (uncredited)

Heinz Bernard

Plainclothes Officer (uncredited)

Frederick Schrecker

Plainclothes Officer (uncredited)

Seth Holt