Nigel Patrick
— Superintendent Robert Hazard
Michael Craig
— Inspector Phil Learoyd
Yvonne Mitchell
— Mildred
Paul Massie
— David Harris
Bernard Miles
— Ted Harris
Olga Lindo
— Mrs. Harris
Earl Cameron
— Dr. Robbins
Gordon Heath
— Paul Slade
Barbara Steele
— Student
Peter Vaughan
— Detective Whitehead (uncredited)
Yvonne Buckingham
— Sapphire Robbins
Jocelyn Britton
— Patsy
Robert Adams
— Horace Big Cigar
Desmond Llewelyn
— Police Constable
Fenella Fielding
— Lingerie Shop Manageress
Susan Stranks
— Student
Freda Bamford
— Sgt. Cook
Rupert Davies
— Ferris
Orlando Martins
— Barman
Harry Baird
— Johnnie Fiddle
Grace Arnold
— Sapphire's Landlady
Thomas Baptiste
— Man on the Street
Victor Brooks
— Police Sgt.
Basil Dignam
— Doctor Burgess
Dorothy Gordon
— Lily
Nora Gordon
— Newsagent's Wife
Lucy Griffiths
— Johnnie Fiddle's Landlady
Vanda Hudson
— Girl at Tulip Club
Dan Jackson
— Nightclub Owner
Philip Lowrie
— Student