Jack Warner
— Maj. Alec White
Nigel Patrick
— Insp. Michael Kenyon
Elizabeth Sellars
— Rita Compton
Terence Morgan
— Roger Compton
Greta Gynt
— Mme. Simonetta
Theodore Bikel
— Max
Eric Pohlmann
— Steven Lasovich
Joyce Grenfell
— Lady Flavia Queensway
Michael Hordern
— Director of Customs
James Gilbert
— Agent Larkins
Martin Boddey
— Sub-Director Holt
Hal Osmond
— Baggage Room Clerk
Jacques Brunius
— Det. Pierre Valance
Ronald Adam
— Mr. Bennett
Jill Adams
— Michael's Dance Partner (uncredited)
John Arnatt
— Customs Officer (uncredited)
Ballard Berkeley
— Cooper
Jacques Cey
— Little Frenchman
Cyril Chamberlain
— Customs Officer
Philip Dale
— A.P.O.
David Davies
— (uncredited)
Guy De Monceau
— Head Waiter (uncredited)
Arnold Diamond
— French Customs Officer
Tom Gill
— Montana Hotel Receptionist
Campbell Gray
— Luigi
George Hilsdon
— Police Driver (uncredited)
John Horsley
— Customs Officer
Robin Hunter
— A.P.O.
Douglas Ives
— Seaman
Hamilton Keene
— Cop at London Airport