Peter Vaughan
Detective Whitehead (uncredited)
Earl Cameron
Dr. Robbins
Barbara Steele
Student
Bernard Miles
Ted Harris
Desmond Llewelyn
Police Constable
Michael Craig
Inspector Phil Learoyd
Paul Massie
David Harris
John Richardson
Student
Yvonne Mitchell
Mildred
Fenella Fielding
Lingerie Shop Manageress
Thomas Baptiste
Man on the Street
Richard Vernon
Doctor at Crime Scene
Gordon Heath
Paul Slade
Rupert Davies
Ferris
Victor Brooks
Police Sgt.
Freda Bamford
Sgt. Cook
Vanda Hudson
Girl at Tulip Club
Basil Dignam
Doctor Burgess
Olga Lindo
Mrs. Harris
Dan Jackson
Nightclub Owner
Nigel Patrick
Superintendent Robert Hazard
Grace Arnold
Sapphire's Landlady
Lloyd Reckord
Pianist in International Club
Dorothy Gordon
Lily
Philip Ray
Mr. Young
Harry Baird
Johnnie Fiddle
Orlando Martins
Barman
Susan Stranks
Student
Yvonne Buckingham
Sapphire Robbins
Lucy Griffiths
Johnnie Fiddle's Landlady
Dolores Mantez
Student (International Club)
Nora Gordon
Newsagent's Wife
Philip Lowrie
Student
Boscoe Holder
Dancer in Nightclub