Alastair Sim

Character: Samuel Blight

Barry K. Barnes

Character: Larry Preston

Diana Churchill

Character: Janet Preston

Edward Chapman

Character: Detective Inspector Bray

Ruby Miller

Character: Mrs. Honeycombe

Austin Trevor

Character: Heinreks

Leo Genn

Character: Another Agent

Geoffrey Sumner

Character: Detective Delacroix

Glen Alyn

Character: Agent Posing as Reporter

Torin Thatcher

Character: Karl Bergsen

Carl Jaffe

Character: Foreign Agent

Cathleen Nesbitt

Character: Miss. Sampson

Cyril Smith

Character: Barber

James Harcourt

Character: Judge