George Nader as Paul Gregory

Maggie Smith as Bridget Howard

Bernard Lee as Victor Sloane, alias Lee Henderson

Geoffrey Keen as Inspector Scott

Bessie Love as Harriet P. Jefferson

Harry H. Corbett as Sullivan

Andrée Melly as Rosa, cocktail waitress

Lionel Jeffries as Pet Shop Owner (uncredited)

Barbara Hicks as Agnes

George Hilsdon as

Glyn Houston as Box office clerk

Noel Howlett as Uncle Tom Howard

Oliver Johnston as Mr. Hobbs, vault official

Lily Kann as Anna Berg

Harry Locke as George Bendel

Howard Marion-Crawford as Mac Cameron, club owner

Lane Meddick as Welsh garage attendant

Charles Price as

Maggie Rennie as Mary

Guy Standeven as

John Welsh as Second Mr. Dodds

Arthur Howard as First Mr. Dodds