Matthew Boulton

as Inspector Grey (uncredited)

as Mr. Bromley

as British Inspector-General

as Dr. Nevin

as Inspector Gregson

as Inspector Graham

as Prince Prentiloff

as Official, Ministry of Home Security (uncredited)

as Coroner (uncredited)

as Inspector Cressney

as Ramsbotham

as John Ramsell Sr.

as Policeman (uncredited)

as Blake, Fingerprints Expert

as Charity Solicitor Twill

as Major Grey

as Inspector Scott

as Sir Raymond Blantyre

as Sir John Haxton

as Ship's Officer (uncredited)

as Inspector Belsize

as Superintendent Talbot

as Fake Police Officer (uncredited)