Alastair Sim

Samuel Blight

Barry K. Barnes

Larry Preston

Diana Churchill

Janet Preston

Edward Chapman

Detective Inspector Bray

Ruby Miller

Mrs. Honeycombe

Austin Trevor

Heinreks

Leo Genn

Another Agent

Geoffrey Sumner

Detective Delacroix

Glen Alyn

Agent Posing as Reporter

Torin Thatcher

Karl Bergsen

Carl Jaffe

Foreign Agent

Cathleen Nesbitt

Miss. Sampson

Cyril Smith

Barber

James Harcourt

Judge