Trailer
Cast
Jack Melford
Detective (uncredited)
Arthur Mullard
(uncredited)
Peter Williams
Detective at Parcels Office (uncredited)
Cecil Parker
Claude, alias 'Major Courtney'
Stratford Johns
Security Guard (uncredited)
Edie Martin
Lettice (uncredited)
Danny Green
'One-Round', alias 'Mr. Lawson'
Herbert Lom
Louis, alias 'Mr. Harvey'
Jack Warner
The Superintendent
Harold Goodwin
Parcels Clerk (uncredited)
Ewan Roberts
Constable (uncredited)
Neil Wilson
Policeman (uncredited)
Alec Guinness
Professor Marcus
Katie Johnson
Mrs. Wilberforce
Sam Kydd
Second Cab Driver (uncredited)
Peter Sellers
Harry, alias 'Mr. Robinson'
Kenneth Connor
Cab Driver (uncredited)
Fred Griffiths
Junk Man (uncredited)
Lucy Griffiths
Miss Pringle (uncredited)