Dr. Crippen

Douglas Bradley-Smith

Dr. Pepper

Olga Lindo

Mrs. Clara Arditti

Elspeth March

Mrs. Jackson

Paul Carpenter

Bruce Martin

John Arnatt

Chief Inspector Dew

Oliver Johnston

Lord Chief Justice

John Lee

Harry

Edward Underdown

The Governor

Hamilton Dyce

Dr. Rogers

Basil Henson

Mr. Arditti

Totti Truman Taylor

Miss Curnow

Edward Cast

Harding

Colin Rix

Chemist

Terence Brook

Police Sergeant Outside Courtroom (uncredited)