Cast
Donald Pleasence
Dr. Hawley Harvey Crippen
Geoffrey Toone
Mr. Tobin
Olga Lindo
Mrs. Clara Arditti
Paul Carpenter
Bruce Martin
Oliver Johnston
Lord Chief Justice
Edward Underdown
The Governor
Coral Browne
Belle Crippen
Samantha Eggar
Ethel Le Neve
Totti Truman Taylor
Miss Curnow
Guy Standeven
Ships Steward (uncredited)
Donald Wolfit
R.D. Muir (as Sir Donald Wolfit)
Basil Henson
Mr. Arditti
Max Faulkner
Radio Officer Andrews (uncredited)
James Robertson Justice
Captain McKenzie
John Arnatt
Chief Inspector Dew
Hamilton Dyce
Dr. Rogers